Treat internals as publics for fake override construction

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrOverridingUtil.kt

@@ -194,7 +194,7 @@ class IrOverridingUtil(
         toFilter: Collection<IrOverridableMember>
     ): Collection<IrOverridableMember> {
         return toFilter.filter { member: IrOverridableMember ->
-            !Visibilities.isPrivate(member.visibility) && isVisibleIgnoringReceiver(member.original, current)
+            !Visibilities.isPrivate(member.visibility)
         }
     }
 

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrVisibilityUtil.kt

@@ -11,40 +11,11 @@ import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue
 // The contents of this file is from VisibilityUtil.kt adapted to IR.
 // TODO: The code would better be commonized for descriptors, ir and fir.
 
-private fun findInvisibleMember(
-    receiver: ReceiverValue?,
-    what: IrDeclarationWithVisibility,
-    from: IrDeclaration
-): IrDeclarationWithVisibility? {
-    // TODO: We need the proper code for IR,
-    // but that requires many of Visibilities.java available in IR.
-    // So for now we stick to a quick hack serving the needs
-    // of fake override construction algorithm.
-    val parentsWithSelf = sequenceOf(what) + what.parents
-    parentsWithSelf.forEach {
-        if (it !is IrDeclarationWithVisibility) return null
-        if (it.visibility == Visibilities.INTERNAL &&
-            (from.module != it.module)
-        ) {
-            return it
-        }
-    }
-    return null
-}
-
-fun isVisibleIgnoringReceiver(
-    what: IrDeclarationWithVisibility,
-    from: IrDeclaration
-): Boolean {
-    return findInvisibleMember(Visibilities.ALWAYS_SUITABLE_RECEIVER, what, from) == null
-}
-
 fun isVisibleForOverride(
     overriding: IrOverridableMember,
     fromSuper: IrOverridableMember
 ): Boolean {
-    return !Visibilities.isPrivate((fromSuper as IrDeclarationWithVisibility).visibility) &&
-            isVisibleIgnoringReceiver(fromSuper, overriding)
+    return !Visibilities.isPrivate((fromSuper as IrDeclarationWithVisibility).visibility)
 }
 
 fun findMemberWithMaxVisibility(members: Collection<IrOverridableMember>): IrOverridableMember {