Make "typeof this" return object in fast compiler.

src/x64/fast-codegen-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1084 matching lines @@
       true_label_ = saved_true;
       false_label_ = saved_false;
       break;
     }
 
     case Token::TYPEOF: {
       Comment cmnt(masm_, "[ UnaryOperation (TYPEOF)");
       ASSERT_EQ(Expression::kValue, expr->expression()->context());
 
       VariableProxy* proxy = expr->expression()->AsVariableProxy();
-      if (proxy != NULL && proxy->var()->is_global()) {
+      if (proxy != NULL &&
+          !proxy->var()->is_this() &&
+          proxy->var()->is_global()) {
         Comment cmnt(masm_, "Global variable");
         __ push(CodeGenerator::GlobalObject());
         __ Move(rcx, proxy->name());
         Handle<Code> ic(Builtins::builtin(Builtins::LoadIC_Initialize));
         // Use a regular load, not a contextual load, to avoid a reference
         // error.
         __ Call(ic, RelocInfo::CODE_TARGET);
         __ movq(Operand(rsp, 0), rax);
       } else if (proxy != NULL &&
                  proxy->var()->slot() != NULL &&
@@ skipping 216 matching lines @@
   true_label_ = saved_true;
   false_label_ = saved_false;
   // Convert current context to test context: End post-test code.
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal