JVM IR: remove obsolete -Xir-check-local-names

This flag was added a long time ago, at the time when we weren't sure if
we were going to keep the naming of local and anonymous classes
completely equal to the naming in the old backend. Now that we've
decided that we won't keep it equal and there are a lot of differences
already, it's not useful anymore.

compiler/backend/src/org/jetbrains/kotlin/codegen/state/GenerationState.kt

@@ -108,7 +108,7 @@ class GenerationState private constructor(
         fun wantsDiagnostics(v: Boolean) =
             apply { wantsDiagnostics = v }
 
-        var jvmBackendClassResolver: JvmBackendClassResolver = JvmBackendClassResolverForModuleWithDependencies(module); private set
+        private var jvmBackendClassResolver: JvmBackendClassResolver = JvmBackendClassResolverForModuleWithDependencies(module)
         fun jvmBackendClassResolver(v: JvmBackendClassResolver) =
             apply { jvmBackendClassResolver = v }
 
@@ -153,8 +153,10 @@ class GenerationState private constructor(
     val deserializationConfiguration: DeserializationConfiguration =
         CompilerDeserializationConfiguration(configuration.languageVersionSettings)
 
-    val deprecationProvider =
-        DeprecationResolver(LockBasedStorageManager.NO_LOCKS, configuration.languageVersionSettings, CoroutineCompatibilitySupport.ENABLED, JavaDeprecationSettings)
+    val deprecationProvider = DeprecationResolver(
+        LockBasedStorageManager.NO_LOCKS, configuration.languageVersionSettings, CoroutineCompatibilitySupport.ENABLED,
+        JavaDeprecationSettings
+    )
 
     init {
         val icComponents = configuration.get(JVMConfigurationKeys.INCREMENTAL_COMPILATION_COMPONENTS)
@@ -250,6 +252,7 @@ class GenerationState private constructor(
     class ForScript {
         // quite a mess, this one is an input from repl interpreter
         var earlierScriptsForReplInterpreter: List<ScriptDescriptor>? = null
+
         // and the rest is an output from the codegen
         var resultFieldName: String? = null
         var resultTypeString: String? = null
@@ -346,7 +349,7 @@ class GenerationState private constructor(
     fun beforeCompile() {
         markUsed()
 
-        if (!isIrBackend || languageVersionSettings.getFlag(JvmAnalysisFlags.irCheckLocalNames)) {
+        if (!isIrBackend) {
             CodegenBinding.initTrace(this)
         }
     }