[NI] Correctly compute definitely not null type for intersection one

{ T : Any? & Foo & Bar? }!! -> { T!! & Foo & Bar }

 Also, fix bug with loosing non-representative number type.
 For example, for type { Byte & SomeType } we lost type `Byte` because
 `getDefaultPrimitiveNumberType` returns null for it

 Fixes #KT-28334 for NI

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/ResultTypeResolver.kt

@@ -128,8 +128,12 @@ class ResultTypeResolver(
                         newSupertypes.add(supertype)
                 }
 
-                TypeUtils.getDefaultPrimitiveNumberType(numberSupertypes)?.let {
-                    newSupertypes.add(it.unwrap())
+
+                val representativeNumberType = TypeUtils.getDefaultPrimitiveNumberType(numberSupertypes)
+                if (representativeNumberType != null) {
+                    newSupertypes.add(representativeNumberType.unwrap())
+                } else {
+                    newSupertypes.addAll(numberSupertypes.map { it.unwrap() })
                 }
 
                 intersectTypes(newSupertypes).makeNullableAsSpecified(commonSuperType.isMarkedNullable)

compiler/testData/diagnostics/tests/generics/nullability/inferNotNullTypeFromIntersectionOfNullableTypes.kt

@@ -0,0 +1,38 @@
+// !LANGUAGE: +NewInference
+
+fun simpleTypeAndNumberType(b: Comparable<*>?) {
+    if (b is Byte?) {
+        <!DEBUG_INFO_SMARTCAST!>b<!>!!.dec()
+    }
+}
+
+fun <T> typeParmeterAndNumberType(b: T?) {
+    if (b is Byte?) {
+        b!!.dec()
+    }
+}
+
+fun anyAndNumberType(b: Any?) {
+    if (b is Byte?) {
+        <!DEBUG_INFO_SMARTCAST!>b<!>!!.dec()
+    }
+}
+
+fun comparableAndNumberType(b: Comparable<Byte>?) {
+    if (b is Byte?) {
+        <!DEBUG_INFO_SMARTCAST!>b<!>!!.dec()
+    }
+}
+
+object SeparateTypes {
+    interface A
+    interface B {
+        fun foo() {}
+    }
+
+    fun separate(a: A?) {
+        if (a is B?) {
+            a!!.foo()
+        }
+    }
+}

compiler/testData/diagnostics/tests/generics/nullability/inferNotNullTypeFromIntersectionOfNullableTypes.txt

@@ -0,0 +1,27 @@
+package
+
+public fun anyAndNumberType(/*0*/ b: kotlin.Any?): kotlin.Unit
+public fun comparableAndNumberType(/*0*/ b: kotlin.Comparable<kotlin.Byte>?): kotlin.Unit
+public fun simpleTypeAndNumberType(/*0*/ b: kotlin.Comparable<*>?): kotlin.Unit
+public fun </*0*/ T> typeParmeterAndNumberType(/*0*/ b: T?): kotlin.Unit
+
+public object SeparateTypes {
+    private constructor SeparateTypes()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final fun separate(/*0*/ a: SeparateTypes.A?): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public interface A {
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public interface B {
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open fun foo(): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -8420,6 +8420,11 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                     runTest("compiler/testData/diagnostics/tests/generics/nullability/functionalBound.kt");
                 }
 
+                @TestMetadata("inferNotNullTypeFromIntersectionOfNullableTypes.kt")
+                public void testInferNotNullTypeFromIntersectionOfNullableTypes() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/generics/nullability/inferNotNullTypeFromIntersectionOfNullableTypes.kt");
+                }
+
                 @TestMetadata("nullToGeneric.kt")
                 public void testNullToGeneric() throws Exception {
                     runTest("compiler/testData/diagnostics/tests/generics/nullability/nullToGeneric.kt");

compiler/tests/org/jetbrains/kotlin/checkers/javac/DiagnosticsUsingJavacTestGenerated.java

@@ -8420,6 +8420,11 @@ public class DiagnosticsUsingJavacTestGenerated extends AbstractDiagnosticsUsing
                     runTest("compiler/testData/diagnostics/tests/generics/nullability/functionalBound.kt");
                 }
 
+                @TestMetadata("inferNotNullTypeFromIntersectionOfNullableTypes.kt")
+                public void testInferNotNullTypeFromIntersectionOfNullableTypes() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/generics/nullability/inferNotNullTypeFromIntersectionOfNullableTypes.kt");
+                }
+
                 @TestMetadata("nullToGeneric.kt")
                 public void testNullToGeneric() throws Exception {
                     runTest("compiler/testData/diagnostics/tests/generics/nullability/nullToGeneric.kt");