FIR: Rewrite Java type mapping

Previoisly, there were two places where mapping had happened:
- toConeKotlinTypeWithNullability
- enhancePossiblyFlexible

The first one was used for supertypes and bounds and the second one
was used for other signature parts

The main idea is to perform type mapping once to a flexible type,
and then use it as it's needed (it's lower bound, or for the further ehnancement)

Also, this commit fixes flexibility for type arguments, see the tests

compiler/testData/loadJava/compiledJava/ClassWithTypePRefNext.fir.txt

@@ -1,4 +1,4 @@
-public open class ClassWithTypePRefNext<R : R|ft<kotlin/collections/MutableIterable<P>, kotlin/collections/MutableIterable<P>?>!|, P> : R|kotlin/Any| {
-    public constructor<R : R|ft<kotlin/collections/MutableIterable<P>, kotlin/collections/MutableIterable<P>?>!|, P>(): R|test/ClassWithTypePRefNext<R, P>|
+public open class ClassWithTypePRefNext<R : R|ft<kotlin/collections/MutableIterable<ft<P, P?>!>, kotlin/collections/Iterable<ft<P, P?>!>?>!|, P> : R|kotlin/Any| {
+    public constructor<R : R|ft<kotlin/collections/MutableIterable<ft<P, P?>!>, kotlin/collections/Iterable<ft<P, P?>!>?>!|, P>(): R|test/ClassWithTypePRefNext<R, P>|
 
 }

compiler/testData/loadJava/compiledJava/ClassWithTypePRefSelf.fir.txt

@@ -1,4 +1,4 @@
-public final class ClassWithTypePRefSelf<P : R|ft<kotlin/Enum<P>, kotlin/Enum<P>?>!|> : R|kotlin/Any| {
-    public constructor<P : R|ft<kotlin/Enum<P>, kotlin/Enum<P>?>!|>(): R|test/ClassWithTypePRefSelf<P>|
+public final class ClassWithTypePRefSelf<P : R|ft<kotlin/Enum<ft<P, P?>!>, kotlin/Enum<ft<P, P?>!>?>!|> : R|kotlin/Any| {
+    public constructor<P : R|ft<kotlin/Enum<ft<P, P?>!>, kotlin/Enum<ft<P, P?>!>?>!|>(): R|test/ClassWithTypePRefSelf<P>|
 
 }

compiler/testData/loadJava/compiledJava/ClassWithTypePRefSelfAndClass.fir.txt

@@ -1,4 +1,4 @@
-public final class ClassWithTypePRefSelfAndClass<P : R|ft<test/ClassWithTypePRefSelfAndClass<P>, test/ClassWithTypePRefSelfAndClass<P>?>!|> : R|kotlin/Any| {
-    public constructor<P : R|ft<test/ClassWithTypePRefSelfAndClass<P>, test/ClassWithTypePRefSelfAndClass<P>?>!|>(): R|test/ClassWithTypePRefSelfAndClass<P>|
+public final class ClassWithTypePRefSelfAndClass<P : R|ft<test/ClassWithTypePRefSelfAndClass<ft<P, P?>!>, test/ClassWithTypePRefSelfAndClass<ft<P, P?>!>?>!|> : R|kotlin/Any| {
+    public constructor<P : R|ft<test/ClassWithTypePRefSelfAndClass<ft<P, P?>!>, test/ClassWithTypePRefSelfAndClass<ft<P, P?>!>?>!|>(): R|test/ClassWithTypePRefSelfAndClass<P>|
 
 }

compiler/testData/loadJava/compiledJava/RemoveRedundantProjectionKind.fir.txt

@@ -1,6 +1,6 @@
 public abstract interface RemoveRedundantProjectionKind : R|kotlin/Any| {
-    public abstract operator fun f(collection: R|ft<kotlin/collections/MutableCollection<out kotlin/CharSequence>, kotlin/collections/Collection<out kotlin/CharSequence>?>!|): R|kotlin/Unit|
+    public abstract operator fun f(collection: R|ft<kotlin/collections/MutableCollection<out ft<kotlin/CharSequence, kotlin/CharSequence?>!>, kotlin/collections/Collection<out ft<kotlin/CharSequence, kotlin/CharSequence?>!>?>!|): R|kotlin/Unit|
 
-    public abstract operator fun f(comparator: R|ft<kotlin/Comparable<in kotlin/CharSequence>, kotlin/Comparable<in kotlin/CharSequence>?>!|): R|kotlin/Unit|
+    public abstract operator fun f(comparator: R|ft<kotlin/Comparable<in ft<kotlin/CharSequence, kotlin/CharSequence?>!>, kotlin/Comparable<in ft<kotlin/CharSequence, kotlin/CharSequence?>!>?>!|): R|kotlin/Unit|
 
 }

compiler/testData/loadJava/compiledJava/WildcardBounds.fir.txt

@@ -1,5 +1,5 @@
 public open class WildcardBounds : R|kotlin/Any| {
-    public/*package*/ open operator fun foo(x: R|ft<test/WildcardBounds.A<out kotlin/CharSequence>, test/WildcardBounds.A<out kotlin/CharSequence>?>!|, y: R|ft<test/WildcardBounds.A<in kotlin/String>, test/WildcardBounds.A<in kotlin/String>?>!|): R|kotlin/Unit|
+    public/*package*/ open operator fun foo(x: R|ft<test/WildcardBounds.A<out ft<kotlin/CharSequence, kotlin/CharSequence?>!>, test/WildcardBounds.A<out ft<kotlin/CharSequence, kotlin/CharSequence?>!>?>!|, y: R|ft<test/WildcardBounds.A<in ft<kotlin/String, kotlin/String?>!>, test/WildcardBounds.A<in ft<kotlin/String, kotlin/String?>!>?>!|): R|kotlin/Unit|
 
     public constructor(): R|test/WildcardBounds|
 

compiler/testData/loadJava/compiledJava/kotlinSignature/MethodWithMappedClasses.fir.txt

@@ -1,7 +1,7 @@
 public open class MethodWithMappedClasses : R|kotlin/Any| {
-    public open operator fun <T> copy(dest: R|ft<kotlin/collections/MutableList<in T>, kotlin/collections/List<in T>?>!|, src: R|ft<kotlin/collections/MutableList<ft<T, T?>!>, kotlin/collections/List<ft<T, T?>!>?>!|): R|kotlin/Unit|
+    public open operator fun <T> copy(dest: R|ft<kotlin/collections/MutableList<in ft<T, T?>!>, kotlin/collections/List<in ft<T, T?>!>?>!|, src: R|ft<kotlin/collections/MutableList<ft<T, T?>!>, kotlin/collections/List<ft<T, T?>!>?>!|): R|kotlin/Unit|
 
-    public open operator fun <T> copyMap(dest: R|ft<kotlin/collections/MutableMap<ft<kotlin/String, kotlin/String?>!, in T>, kotlin/collections/Map<ft<kotlin/String, kotlin/String?>!, in T>?>!|, src: R|ft<kotlin/collections/MutableMap<ft<kotlin/String, kotlin/String?>!, ft<T, T?>!>, kotlin/collections/Map<ft<kotlin/String, kotlin/String?>!, ft<T, T?>!>?>!|): R|kotlin/Unit|
+    public open operator fun <T> copyMap(dest: R|ft<kotlin/collections/MutableMap<ft<kotlin/String, kotlin/String?>!, in ft<T, T?>!>, kotlin/collections/Map<ft<kotlin/String, kotlin/String?>!, in ft<T, T?>!>?>!|, src: R|ft<kotlin/collections/MutableMap<ft<kotlin/String, kotlin/String?>!, ft<T, T?>!>, kotlin/collections/Map<ft<kotlin/String, kotlin/String?>!, ft<T, T?>!>?>!|): R|kotlin/Unit|
 
     public constructor(): R|test/MethodWithMappedClasses|
 

compiler/testData/loadJava/compiledJava/kotlinSignature/MethodWithTypeParameters.fir.txt

@@ -1,5 +1,5 @@
 public open class MethodWithTypeParameters : R|kotlin/Any| {
-    public open operator fun <A, B : R|ft<java/lang/Runnable, java/lang/Runnable?>!|, R|ft<kotlin/collections/MutableList<kotlin/Cloneable>, kotlin/collections/MutableList<kotlin/Cloneable>?>!|> foo(a: R|ft<A, A?>!|, b: R|ft<kotlin/collections/MutableList<out B>, kotlin/collections/List<out B>?>!|, list: R|ft<kotlin/collections/MutableList<in kotlin/String>, kotlin/collections/List<in kotlin/String>?>!|): R|kotlin/Unit|
+    public open operator fun <A, B : R|ft<java/lang/Runnable, java/lang/Runnable?>!|, R|ft<kotlin/collections/MutableList<ft<kotlin/Cloneable, kotlin/Cloneable?>!>, kotlin/collections/List<ft<kotlin/Cloneable, kotlin/Cloneable?>!>?>!|> foo(a: R|ft<A, A?>!|, b: R|ft<kotlin/collections/MutableList<out ft<B, B?>!>, kotlin/collections/List<out ft<B, B?>!>?>!|, list: R|ft<kotlin/collections/MutableList<in ft<kotlin/String, kotlin/String?>!>, kotlin/collections/List<in ft<kotlin/String, kotlin/String?>!>?>!|): R|kotlin/Unit|
 
     public constructor(): R|test/MethodWithTypeParameters|
 

compiler/testData/loadJava/compiledJava/kotlinSignature/PropertyArrayTypes.fir.txt

@@ -1,5 +1,5 @@
 public open class PropertyArrayTypes<T> : R|kotlin/Any| {
-    public open field arrayOfArrays: R|ft<kotlin/Array<ft<kotlin/Array<ft<kotlin/String, kotlin/String?>!>, kotlin/Array<ft<kotlin/String, kotlin/String?>!>?>!>, kotlin/Array<out ft<kotlin/Array<ft<kotlin/String, kotlin/String?>!>, kotlin/Array<ft<kotlin/String, kotlin/String?>!>?>!>?>!|
+    public open field arrayOfArrays: R|ft<kotlin/Array<ft<kotlin/Array<ft<kotlin/String, kotlin/String?>!>, kotlin/Array<out ft<kotlin/String, kotlin/String?>!>?>!>, kotlin/Array<out ft<kotlin/Array<ft<kotlin/String, kotlin/String?>!>, kotlin/Array<out ft<kotlin/String, kotlin/String?>!>?>!>?>!|
 
     public open field array: R|ft<kotlin/Array<ft<kotlin/String, kotlin/String?>!>, kotlin/Array<out ft<kotlin/String, kotlin/String?>!>?>!|
 

compiler/testData/loadJava/compiledJava/kotlinSignature/error/WrongTypeParameterBoundStructure1.fir.txt

@@ -1,5 +1,5 @@
 public open class WrongTypeParameterBoundStructure1 : R|kotlin/Any| {
-    public open operator fun <A, B : R|ft<java/lang/Runnable, java/lang/Runnable?>!|, R|ft<kotlin/collections/MutableList<kotlin/Cloneable>, kotlin/collections/MutableList<kotlin/Cloneable>?>!|> foo(a: R|ft<A, A?>!|, b: R|ft<kotlin/collections/MutableList<out B>, kotlin/collections/List<out B>?>!|): R|kotlin/Unit|
+    public open operator fun <A, B : R|ft<java/lang/Runnable, java/lang/Runnable?>!|, R|ft<kotlin/collections/MutableList<ft<kotlin/Cloneable, kotlin/Cloneable?>!>, kotlin/collections/List<ft<kotlin/Cloneable, kotlin/Cloneable?>!>?>!|> foo(a: R|ft<A, A?>!|, b: R|ft<kotlin/collections/MutableList<out ft<B, B?>!>, kotlin/collections/List<out ft<B, B?>!>?>!|): R|kotlin/Unit|
 
     public constructor(): R|test/WrongTypeParameterBoundStructure1|
 

compiler/testData/loadJava/compiledJava/library/Max.fir.txt

@@ -1,5 +1,5 @@
 public open class Max : R|kotlin/Any| {
-    public open operator fun <T : R|ft<kotlin/Any, kotlin/Any?>!|, R|ft<kotlin/Comparable<in T>, kotlin/Comparable<in T>?>!|> max(coll: R|ft<kotlin/collections/MutableCollection<out T>, kotlin/collections/Collection<out T>?>!|): R|ft<T, T?>!|
+    public open operator fun <T : R|ft<kotlin/Any, kotlin/Any?>!|, R|ft<kotlin/Comparable<in ft<T, T?>!>, kotlin/Comparable<in ft<T, T?>!>?>!|> max(coll: R|ft<kotlin/collections/MutableCollection<out ft<T, T?>!>, kotlin/collections/Collection<out ft<T, T?>!>?>!|): R|ft<T, T?>!|
 
     public constructor(): R|test/Max|
 

compiler/testData/loadJava/compiledJava/mutability/ReadOnlyExtendsWildcard.fir.txt

@@ -1,6 +1,6 @@
 public abstract interface ReadOnlyExtendsWildcard : R|kotlin/Any| {
     public abstract operator fun bar(): R|kotlin/Unit|
 
-    public abstract operator fun foo(@R|kotlin/annotations/jvm/ReadOnly|() x: R|ft<kotlin/collections/List<out kotlin/CharSequence>, kotlin/collections/List<out kotlin/CharSequence>?>!|, @R|org/jetbrains/annotations/NotNull|() y: R|kotlin/Comparable<in kotlin/String>|): R|kotlin/Unit|
+    public abstract operator fun foo(@R|kotlin/annotations/jvm/ReadOnly|() x: R|ft<kotlin/collections/List<out ft<kotlin/CharSequence, kotlin/CharSequence?>!>, kotlin/collections/List<out ft<kotlin/CharSequence, kotlin/CharSequence?>!>?>!|, @R|org/jetbrains/annotations/NotNull|() y: R|kotlin/Comparable<in ft<kotlin/String, kotlin/String?>!>|): R|kotlin/Unit|
 
 }

compiler/testData/loadJava/compiledJava/notNull/NotNullIntArray.fir.txt

@@ -1,5 +1,5 @@
 public open class NotNullIntArray : R|kotlin/Any| {
-    @R|org/jetbrains/annotations/NotNull|() public open operator fun hi(): R|ft<kotlin/IntArray, kotlin/IntArray?>!|
+    @R|org/jetbrains/annotations/NotNull|() public open operator fun hi(): R|kotlin/IntArray|
 
     public constructor(): R|test/NotNullIntArray|
 

compiler/testData/loadJava/compiledJava/notNull/NotNullObjectArray.fir.txt

@@ -1,5 +1,5 @@
 public open class NotNullObjectArray : R|kotlin/Any| {
-    @R|org/jetbrains/annotations/NotNull|() public open operator fun hi(): R|ft<kotlin/Array<ft<kotlin/Any, kotlin/Any?>!>, kotlin/Array<out ft<kotlin/Any, kotlin/Any?>!>?>!|
+    @R|org/jetbrains/annotations/NotNull|() public open operator fun hi(): R|ft<kotlin/Array<ft<kotlin/Any, kotlin/Any?>!>, kotlin/Array<out ft<kotlin/Any, kotlin/Any?>!>>|
 
     public constructor(): R|test/NotNullObjectArray|
 

compiler/testData/loadJava/compiledJava/sam/GenericInterfaceParameterWithSelfBound.fir.txt

@@ -1,4 +1,4 @@
-public abstract interface GenericInterfaceParameterWithSelfBound<T : R|ft<test/GenericInterfaceParameterWithSelfBound<T>, test/GenericInterfaceParameterWithSelfBound<T>?>!|> : R|kotlin/Any| {
+public abstract interface GenericInterfaceParameterWithSelfBound<T : R|ft<test/GenericInterfaceParameterWithSelfBound<ft<T, T?>!>, test/GenericInterfaceParameterWithSelfBound<ft<T, T?>!>?>!|> : R|kotlin/Any| {
     public abstract operator fun method(t: R|ft<T, T?>!|): R|ft<T, T?>!|
 
 }

compiler/testData/loadJava/compiledJava/sam/GenericInterfaceParametersWithBounds.fir.txt

@@ -1,4 +1,4 @@
-public abstract interface GenericInterfaceParametersWithBounds<A : R|ft<kotlin/Comparable<A>, kotlin/Comparable<A>?>!|, R|ft<kotlin/Cloneable, kotlin/Cloneable?>!|, B : R|ft<kotlin/collections/MutableList<A>, kotlin/collections/MutableList<A>?>!|> : R|kotlin/Any| {
+public abstract interface GenericInterfaceParametersWithBounds<A : R|ft<kotlin/Comparable<ft<A, A?>!>, kotlin/Comparable<ft<A, A?>!>?>!|, R|ft<kotlin/Cloneable, kotlin/Cloneable?>!|, B : R|ft<kotlin/collections/MutableList<ft<A, A?>!>, kotlin/collections/List<ft<A, A?>!>?>!|> : R|kotlin/Any| {
     public abstract operator fun method(a: R|ft<kotlin/Array<ft<A, A?>!>, kotlin/Array<out ft<A, A?>!>?>!|, b: R|ft<B, B?>!|): R|kotlin/Unit|
 
 }

compiler/testData/loadJava/compiledJava/sam/GenericMethodParameters.fir.txt

@@ -1,4 +1,4 @@
 public abstract interface GenericMethodParameters : R|kotlin/Any| {
-    public abstract operator fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>!|, B : R|ft<kotlin/collections/MutableList<A>, kotlin/collections/MutableList<A>?>!|> method(a: R|ft<kotlin/Array<ft<A, A?>!>, kotlin/Array<out ft<A, A?>!>?>!|, b: R|ft<B, B?>!|): R|kotlin/Unit|
+    public abstract operator fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>!|, B : R|ft<kotlin/collections/MutableList<ft<A, A?>!>, kotlin/collections/List<ft<A, A?>!>?>!|> method(a: R|ft<kotlin/Array<ft<A, A?>!>, kotlin/Array<out ft<A, A?>!>?>!|, b: R|ft<B, B?>!|): R|kotlin/Unit|
 
 }

compiler/testData/loadJava/compiledJava/sam/adapters/NonTrivialFunctionType.fir.txt

@@ -5,7 +5,7 @@ public open class NonTrivialFunctionType : R|kotlin/Any| {
 
     public open operator fun wildcardUnbound(comparator: R|ft<java/util/Comparator<*>, java/util/Comparator<*>?>!|): R|kotlin/Unit|
 
-    public open operator fun wildcardBound(comparator: R|ft<java/util/Comparator<in kotlin/CharSequence>, java/util/Comparator<in kotlin/CharSequence>?>!|): R|kotlin/Unit|
+    public open operator fun wildcardBound(comparator: R|ft<java/util/Comparator<in ft<kotlin/CharSequence, kotlin/CharSequence?>!>, java/util/Comparator<in ft<kotlin/CharSequence, kotlin/CharSequence?>!>?>!|): R|kotlin/Unit|
 
     public constructor(): R|test/NonTrivialFunctionType|
 

compiler/testData/loadJava/compiledJava/sam/adapters/TypeParameterOfMethod.fir.txt

@@ -3,7 +3,7 @@ public open class TypeParameterOfMethod : R|kotlin/Any| {
 
     public open static operator fun <T : R|ft<kotlin/CharSequence, kotlin/CharSequence?>!|> max2(comparator: R|ft<java/util/Comparator<ft<T, T?>!>, java/util/Comparator<ft<T, T?>!>?>!|, value1: R|ft<T, T?>!|, value2: R|ft<T, T?>!|): R|ft<T, T?>!|
 
-    public open static operator fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>!|, B : R|ft<kotlin/collections/MutableList<A>, kotlin/collections/MutableList<A>?>!|> method(a: R|ft<java/util/Comparator<ft<A, A?>!>, java/util/Comparator<ft<A, A?>!>?>!|, b: R|ft<B, B?>!|): R|kotlin/Unit|
+    public open static operator fun <A : R|ft<kotlin/CharSequence, kotlin/CharSequence?>!|, B : R|ft<kotlin/collections/MutableList<ft<A, A?>!>, kotlin/collections/List<ft<A, A?>!>?>!|> method(a: R|ft<java/util/Comparator<ft<A, A?>!>, java/util/Comparator<ft<A, A?>!>?>!|, b: R|ft<B, B?>!|): R|kotlin/Unit|
 
     public constructor(): R|test/TypeParameterOfMethod|