Revert attempt to optimize away the allocation of a temporary.

src/x64/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 1386 matching lines @@
   }
 
   ZoneList<Expression*>* args = node->arguments();
   Comment cmnt(masm_, "[ CallRuntime");
   Runtime::Function* function = node->function();
 
   if (function == NULL) {
     // Prepare stack for calling JS runtime function.
     frame_->Push(node->name());
     // Push the builtins object found in the current global object.
-    __ movq(kScratchRegister, GlobalObject());
-    __ movq(kScratchRegister,
-            FieldOperand(kScratchRegister, GlobalObject::kBuiltinsOffset));
-    frame_->Push(kScratchRegister);
+    Result temp = allocator()->Allocate();
+    ASSERT(temp.is_valid());
+    __ movq(temp.reg(), GlobalObject());
+    __ movq(temp.reg(),
+            FieldOperand(temp.reg(), GlobalObject::kBuiltinsOffset));
+    frame_->Push(&temp);
   }
 
   // Push the arguments ("left-to-right").
   int arg_count = args->length();
   for (int i = 0; i < arg_count; i++) {
     Load(args->at(i));
   }
 
   if (function == NULL) {
     // Call the JS runtime function.
@@ skipping 2567 matching lines @@
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal