Fix bug in the fast compiler's object literal code...

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 648 matching lines @@
   __ bind(&boilerplate_exists);
   // rax contains boilerplate.
   // Clone boilerplate.
   __ push(rax);
   if (expr->depth() == 1) {
     __ CallRuntime(Runtime::kCloneShallowLiteralBoilerplate, 1);
   } else {
     __ CallRuntime(Runtime::kCloneLiteralBoilerplate, 1);
   }
 
-  // If result_saved == true: the result is saved on top of the stack.
-  // If result_saved == false: the result is not on the stack, just in rax.
+  // If result_saved == true: The result is saved on top of the
+  //  stack and in rax.
+  // If result_saved == false: The result not on the stack, just in rax.
   bool result_saved = false;
 
   for (int i = 0; i < expr->properties()->length(); i++) {
     ObjectLiteral::Property* property = expr->properties()->at(i);
     if (property->IsCompileTimeValue()) continue;
 
     Literal* key = property->key();
     Expression* value = property->value();
     if (!result_saved) {
       __ push(rax);  // Save result on the stack
       result_saved = true;
     }
     switch (property->kind()) {
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:  // fall through
         ASSERT(!CompileTimeValue::IsCompileTimeValue(value));
       case ObjectLiteral::Property::COMPUTED:
         if (key->handle()->IsSymbol()) {
           Visit(value);
           ASSERT_EQ(Expression::kValue, value->context());
           __ pop(rax);
           __ Move(rcx, key->handle());
           Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Initialize));
           __ call(ic, RelocInfo::CODE_TARGET);
           // StoreIC leaves the receiver on the stack.
+          __ movq(rax, Operand(rsp, 0));  // Restore result back into rax.
           break;
         }
         // fall through
       case ObjectLiteral::Property::PROTOTYPE:
         __ push(rax);
         Visit(key);
         ASSERT_EQ(Expression::kValue, key->context());
         Visit(value);
         ASSERT_EQ(Expression::kValue, value->context());
         __ CallRuntime(Runtime::kSetProperty, 3);
@@ skipping 959 matching lines @@
   true_label_ = saved_true;
   false_label_ = saved_false;
   // Convert current context to test context: End post-test code.
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal