Fix local anonymous class name error in K2MetadataCompiler

Extract the logic of approximating to denotable class supertype
from JS/KLIB and use it in metadata compiler.

^KT-20996 In Progress

compiler/serialization/src/org/jetbrains/kotlin/serialization/ApproximatingStringTable.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.serialization
+
+import org.jetbrains.kotlin.builtins.StandardNames
+import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
+import org.jetbrains.kotlin.descriptors.ClassifierDescriptorWithTypeParameters
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.resolve.descriptorUtil.classId
+import org.jetbrains.kotlin.resolve.descriptorUtil.getAllSuperClassifiers
+
+open class ApproximatingStringTable : StringTableImpl() {
+    override fun getLocalClassIdReplacement(descriptor: ClassifierDescriptorWithTypeParameters): ClassId? {
+        return if (descriptor.containingDeclaration is CallableMemberDescriptor) {
+            val superClassifiers = descriptor.getAllSuperClassifiers()
+                .mapNotNull { it as ClassifierDescriptorWithTypeParameters }
+                .filter { it != descriptor }
+                .toList()
+            if (superClassifiers.size == 1) {
+                superClassifiers[0].classId
+            } else {
+                val superClass = superClassifiers.find { !DescriptorUtils.isInterface(it) }
+                superClass?.classId ?: ClassId.topLevel(StandardNames.FqNames.any.toSafe())
+            }
+        } else {
+            super.getLocalClassIdReplacement(descriptor)
+        }
+    }
+}