[NI] Use alternative to intersection type in public declarations

The new inference uses inferred intersection types normally, unlike the old inference.
However, intersection types in public declarations are approximated to supertype, which
potentially may give a less presice type, then it would be with the OI.
For non-related T1, T2 the NI approximates {T1 & T2} to Any in public declarations,
and if the OI was inferring T1 instead of the intersection type, it may lead to
less precise declaration type and related errors.

The solution is to remember an alternative for an intersection type when present.
Before approximation the alternative replaces the intersection type.

^KT-36249 Fixed

compiler/testData/diagnostics/testsWithStdLib/inference/kt36249.fir.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER UNUSED_VARIABLE -UNUSED_EXPRESSION
+
+import kotlin.reflect.KClass
+fun <T : PsiElement> select(vararg classes: KClass<out T>): T? {
+    return null
+}
+interface PomRenameableTarget
+interface PsiElement
+interface PsiMethod : PsiElement, PomRenameableTarget
+interface PsiClass : PsiElement, PomRenameableTarget
+
+class A {
+    val inv get() = select(PsiMethod::class, PsiClass::class)
+}
+
+fun main() {
+    A().inv
+}

compiler/testData/diagnostics/testsWithStdLib/inference/kt36249.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER UNUSED_VARIABLE -UNUSED_EXPRESSION
+
+import kotlin.reflect.KClass
+fun <T : PsiElement> select(vararg classes: KClass<out T>): T? {
+    return null
+}
+interface PomRenameableTarget
+interface PsiElement
+interface PsiMethod : PsiElement, PomRenameableTarget
+interface PsiClass : PsiElement, PomRenameableTarget
+
+class A {
+    val inv get() = select(PsiMethod::class, PsiClass::class)
+}
+
+fun main() {
+    <!DEBUG_INFO_EXPRESSION_TYPE("PsiElement?")!>A().inv<!>
+}

compiler/testData/diagnostics/testsWithStdLib/inference/kt36249.txt

@@ -0,0 +1,36 @@
+package
+
+public fun main(): kotlin.Unit
+public fun </*0*/ T : PsiElement> select(/*0*/ vararg classes: kotlin.reflect.KClass<out T> /*kotlin.Array<out kotlin.reflect.KClass<out T>>*/): T?
+
+public final class A {
+    public constructor A()
+    public final val inv: PsiElement?
+    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 PomRenameableTarget {
+    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 PsiClass : PsiElement, PomRenameableTarget {
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface PsiElement {
+    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 PsiMethod : PsiElement, PomRenameableTarget {
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}