Clean up the Result class. Reduce the size of Result from four words...

src/register-allocator-inl.h

 // 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 23 matching lines @@
 
 namespace v8 { namespace internal {
 
 Result::~Result() {
   if (is_register()) cgen_->allocator()->Unuse(reg());
 }
 
 
 void Result::Unuse() {
   if (is_register()) cgen_->allocator()->Unuse(reg());
-  type_ = INVALID;
+  invalidate();
+}
+
+
+void Result::CopyTo(Result* destination) const {
+  destination->value_ = value_;
+  if (is_register()) cgen_->allocator()->Use(reg());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGISTER_ALLOCATOR_INL_H_