[K2/N] Use FqName to mangle invisible class-like symbol in fake override

^KT-57484

Merge-request: KT-MR-10263
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/backend/handlers/IrPrettyKotlinDumpHandler.kt

@@ -70,8 +70,8 @@ internal fun dumpModuleKotlinLike(
     info.processAllIrModuleFragments(module) { irModuleFragment, moduleName ->
         val irFiles = irModuleFragment.files
         val builder = multiModuleInfoDumper.builderForModule(moduleName)
-        val filteredIrFiles = irFiles.groupWithTestFiles(module).filterNot {
-            it.first?.directives?.contains(EXTERNAL_FILE) == true
+        val filteredIrFiles = irFiles.groupWithTestFiles(module).filterNot { (testFile, _) ->
+            testFile?.let { EXTERNAL_FILE in it.directives || it.isAdditional } ?: false
         }.map { it.second }
         val printFileName = filteredIrFiles.size > 1 || allModules.size > 1
         val modifiedOptions = options.copy(printFileName = printFileName)

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/runners/codegen/BaseCodegenConfiguration.kt

@@ -149,7 +149,7 @@ fun TestConfigurationBuilder.commonHandlersForCodegenTest() {
 }
 
 fun HandlersStepBuilder<IrBackendInput>.dumpHandlersForConverterStep() {
-    useHandlers(::IrTreeVerifierHandler, ::IrTextDumpHandler)
+    useHandlers(::IrTreeVerifierHandler, ::IrTextDumpHandler, ::IrMangledNameAndSignatureDumpHandler)
 }
 
 fun HandlersStepBuilder<BinaryArtifacts.Jvm>.dumpHandlersForBackendStep() {