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

src/register-allocator-inl.h

Index: src/register-allocator-inl.h
===================================================================
--- src/register-allocator-inl.h	(revision 1960)
+++ src/register-allocator-inl.h	(working copy)
@@ -41,10 +41,16 @@
 
 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_