[FIR] Don't remove subsumed members from intersection overrides's overriddens

This fixes a bunch of missing overridden symbols in IR.
This is also required for fixing KT-59921 in the following commit
where we need to keep all overridden symbols of intersection overrides
so that we can enhance them properly.

#KT-57300 Fixed
#KT-57299 Fixed
#KT-59921
#KT-57300
#KT-62788
#KT-64271
#KT-64382

compiler/testData/diagnostics/tests/override/clashesOnInheritance/intersectionReturnTypeMismatchSubsumed.kt

@@ -0,0 +1,41 @@
+// FIR_IDENTICAL
+
+// FILE: test.kt
+
+// We inherit getReturnType
+// from CallableDescriptor with return type String? and
+// from ClassConstructorDescriptorImpl with return type String
+// but because ClassConstructorDescriptorImpl.getReturnType subsumes CallableDescriptor.getReturnType, we don't report RETURN_TYPE_MISMATCH_ON_INHERITANCE.
+class DeserializedClassConstructorDescriptor : CallableDescriptor, ClassConstructorDescriptorImpl()
+
+// FILE: ClassConstructorDescriptorImpl.java
+
+// IJ reports an inspection warning
+// "Non-annotated method 'getReturnType' from 'FunctionDescriptorImpl' implements non-null method from 'ConstructorDescriptor'"
+// which is the underlying issue.
+public class ClassConstructorDescriptorImpl extends FunctionDescriptorImpl implements ConstructorDescriptor {}
+
+// FILE: FunctionDescriptorImpl.java
+public abstract class FunctionDescriptorImpl implements CallableDescriptor {
+    @Override
+    public String getReturnType() {
+        return null;
+    }
+}
+
+// FILE: ConstructorDescriptor.java
+import org.jetbrains.annotations.NotNull;
+
+public interface ConstructorDescriptor extends CallableDescriptor {
+    @NotNull
+    @Override
+    String getReturnType();
+}
+
+// FILE: CallableDescriptor.java
+import org.jetbrains.annotations.Nullable;
+
+public interface CallableDescriptor {
+    @Nullable
+    String getReturnType();
+}

compiler/testData/diagnostics/tests/override/intersectionOfAbstractAndOpen.kt

@@ -0,0 +1,54 @@
+// FIR_IDENTICAL
+
+// FILE: VertLikeTable.java
+public interface VertLikeTable extends BasicModMajorObject, BasicModTableOrView, BasicModIdentifiedElement
+// FILE: BasicModMajorObject.java
+public interface BasicModMajorObject extends BasicMajorObject, BasicModSchemaObject
+// FILE: BasicMajorObject.java
+public interface BasicMajorObject extends BasicSchemaObject, DasSchemaChild
+// FILE: BasicSchemaObject.java
+public interface BasicSchemaObject extends BasicNamedElement
+// FILE: BasicNamedElement.java
+public interface BasicNamedElement extends BasicElement {
+    @Override
+    void foo();
+}
+// FILE: BasicElement.java
+public interface BasicElement extends BasicMixinElement
+// FILE: BasicMixinElement.java
+public interface BasicMixinElement extends DasObject
+// FILE: DasObject.java
+public interface DasObject {
+    default void foo() {}
+}
+// FILE: DasSchemaChild.java
+public interface DasSchemaChild extends DasObject
+// FILE: BasicModSchemaObject.java
+public interface BasicModSchemaObject extends BasicSchemaObject, BasicModNamedElement
+// FILE: BasicModNamedElement.java
+public interface BasicModNamedElement extends BasicNamedElement, BasicModElement
+// FILE: BasicModElement.java
+public interface BasicModElement extends BasicElement, BasicModMixinElement
+// FILE: BasicModMixinElement.java
+public interface BasicModMixinElement extends BasicMixinElement
+// FILE: BasicModTableOrView.java
+public interface BasicModTableOrView extends BasicTableOrView, BasicModLikeTable
+// FILE: BasicTableOrView.java
+public interface BasicTableOrView extends BasicLikeTable, BasicMixinTableOrView
+// FILE: BasicLikeTable.java
+public interface BasicLikeTable extends BasicNamedElement
+// FILE: BasicMixinTableOrView.java
+public interface BasicMixinTableOrView extends DasTable
+// FILE: DasTable.java
+public interface DasTable extends DasSchemaChild
+// FILE: BasicModLikeTable.java
+public interface BasicModLikeTable extends BasicLikeTable, BasicModNamedElement
+// FILE: BasicModIdentifiedElement.java
+public interface BasicModIdentifiedElement extends BasicIdentifiedElement, BasicModElement
+// FILE: BasicIdentifiedElement.java
+public interface BasicIdentifiedElement extends BasicElement
+
+// FILE: test.kt
+fun foo(t: VertLikeTable) {
+    t.foo()
+}

compiler/testData/diagnostics/tests/override/intersectionOfSubstitutedProperties.kt

@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+
+abstract class C<T, ModelPropertyT : ModelListPropertyCore<T>>() :
+    A<ModelPropertyT, T>(),
+    I<List<T>>
+
+abstract class A<out ModelPropertyT : ModelPropertyCore<*>, T> {
+    abstract val property: ModelPropertyT
+}
+
+interface I<out T> {
+    val property: ModelPropertyCore<out T>
+}
+
+interface ModelListPropertyCore<T> : ModelPropertyCore<List<T>>
+interface ModelPropertyCore<T>

compiler/testData/diagnostics/tests/override/intersectionOverrideWithSubsumedDifferentType.kt

@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+
+interface UAnnotationEx : UAnnotation, UAnchorOwner
+interface UAnchorOwner : UElement
+interface UElement {
+    val psi: PsiElement?
+
+    val javaPsi: PsiElement?
+        get() = psi
+}
+interface UAnnotation : UElement {
+    override val javaPsi: PsiAnnotation?
+}
+
+interface PsiElement
+interface PsiAnnotation : PsiElement

compiler/testData/diagnostics/tests/override/intersectionOverridesIntersection.kt

@@ -0,0 +1,21 @@
+// FIR_IDENTICAL
+
+// inherits accept from FirDeclarationStatusImpl and FirResolvedDeclarationStatus
+class FirResolvedDeclarationStatusImpl : FirDeclarationStatusImpl(), FirResolvedDeclarationStatus
+
+// inherits accept from FirElement and FirDeclarationStatus
+open class FirDeclarationStatusImpl : FirPureAbstractElement(), FirDeclarationStatus
+
+abstract class FirPureAbstractElement : FirElement
+
+interface FirResolvedDeclarationStatus : FirDeclarationStatus {
+    override fun accept() {}
+}
+
+interface FirDeclarationStatus : FirElement {
+    override fun accept() {}
+}
+
+interface FirElement {
+    fun accept() {}
+}

compiler/testData/diagnostics/tests/override/intersectionWithSubsumedWithSubstitution.kt

@@ -0,0 +1,18 @@
+// FIR_IDENTICAL
+
+class KtFirPsiJavaClassSymbol : KtFirNamedClassOrObjectSymbolBase(), KtFirPsiSymbol<String, String>
+open class KtFirNamedClassOrObjectSymbolBase : KtNamedClassOrObjectSymbol(), KtFirSymbol<String>
+abstract class KtNamedClassOrObjectSymbol : KtLifetimeOwner
+
+interface KtFirPsiSymbol<P, S> : KtFirSymbol<S>
+
+interface KtLifetimeOwner {
+    val token: String
+}
+
+interface KtSymbol : KtLifetimeOwner
+
+interface KtFirSymbol<out S> : KtSymbol, KtLifetimeOwner {
+    override val token: String get() = ""
+}
+