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

src/pending-compilation-error-handler.h

 // 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.
 
 #ifndef V8_PENDING_COMPILATION_ERROR_HANDLER_H_
 #define V8_PENDING_COMPILATION_ERROR_HANDLER_H_
 
 #include "src/base/macros.h"
 #include "src/globals.h"
 #include "src/handles.h"
@@ skipping 40 matching lines @@
     if (has_pending_error_) return;
     has_pending_error_ = true;
     start_position_ = start_position;
     end_position_ = end_position;
     message_ = message;
     char_arg_ = nullptr;
     arg_ = arg;
     error_type_ = error_type;
   }
 
-  void ReportMessageAt(int start_position, int end_position,
-                       MessageTemplate::Template message, Handle<String> arg,
-                       ParseErrorType error_type = kSyntaxError) {
-    if (has_pending_error_) return;
-    has_pending_error_ = true;
-    start_position_ = start_position;
-    end_position_ = end_position;
-    message_ = message;
-    char_arg_ = nullptr;
-    arg_ = nullptr;
-    handle_arg_ = arg;
-    error_type_ = error_type;
-  }
-
   bool has_pending_error() const { return has_pending_error_; }
 
   void ThrowPendingError(Isolate* isolate, Handle<Script> script);
   Handle<String> FormatMessage(Isolate* isolate);
 
  private:
   Handle<String> ArgumentString(Isolate* isolate);
 
   bool has_pending_error_;
   int start_position_;
   int end_position_;
   MessageTemplate::Template message_;
   const AstRawString* arg_;
   const char* char_arg_;
-  Handle<String> handle_arg_;
   ParseErrorType error_type_;
 
   DISALLOW_COPY_AND_ASSIGN(PendingCompilationErrorHandler);
 };
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_PENDING_COMPILATION_ERROR_HANDLER_H_