[IR] Split FakeOverrideBuilder to two parts

Now there is separate class encapsulating logic about how to build
fakeOverrides and one encapsulating logic of which classes
do need building fake overrides.

This also allows to untie strange inheritance dependencies.

^KT-61934

compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsIrLinker.kt

@@ -6,7 +6,7 @@
 package org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir
 
 import org.jetbrains.kotlin.backend.common.linkage.partial.PartialLinkageSupportForLinker
-import org.jetbrains.kotlin.backend.common.overrides.FakeOverrideBuilder
+import org.jetbrains.kotlin.backend.common.overrides.IrLinkerFakeOverrideProvider
 import org.jetbrains.kotlin.backend.common.serialization.*
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.ir.IrBuiltIns
@@ -39,7 +39,7 @@ class JsIrLinker(
         symbol
     }) {
 
-    override val fakeOverrideBuilder = FakeOverrideBuilder(
+    override val fakeOverrideBuilder = IrLinkerFakeOverrideProvider(
         linker = this,
         symbolTable = symbolTable,
         mangler = JsManglerIr,