Reland: [Compiler] Enable handles created during parsing and scope analysis to be deferred.

src/pending-compilation-error-handler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/pending-compilation-error-handler.h"
 
 #include "src/ast/ast-value-factory.h"
 #include "src/debug/debug.h"
 #include "src/handles.h"
 #include "src/isolate.h"
 #include "src/messages.h"
 
 namespace v8 {
 namespace internal {
 
 Handle<String> PendingCompilationErrorHandler::ArgumentString(
     Isolate* isolate) {
   if (arg_ != NULL) return arg_->string();
   if (char_arg_ != NULL) {
     return isolate->factory()
         ->NewStringFromUtf8(CStrVector(char_arg_))
         .ToHandleChecked();
   }
-  if (!handle_arg_.is_null()) return handle_arg_;
   return isolate->factory()->undefined_string();
 }
 
 Handle<String> PendingCompilationErrorHandler::FormatMessage(Isolate* isolate) {
   return MessageTemplate::FormatMessage(isolate, message_,
                                         ArgumentString(isolate));
 }
 
 void PendingCompilationErrorHandler::ThrowPendingError(Isolate* isolate,
                                                        Handle<Script> script) {
@@ skipping 33 matching lines @@
                         handle(Smi::FromInt(location.end_pos()), isolate),
                         SLOPPY).Check();
 
   Handle<Name> key_script = factory->error_script_symbol();
   JSObject::SetProperty(jserror, key_script, script, SLOPPY).Check();
 
   isolate->Throw(*error, &location);
 }
 }  // namespace internal
 }  // namespace v8