Change the register allocator so that it no longer tracks references...

src/jump-target-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 20 matching lines @@
 namespace v8 {
 namespace internal {
 
 CodeGenerator* JumpTarget::cgen() {
   return CodeGeneratorScope::Current();
 }
 
 void JumpTarget::InitializeEntryElement(int index, FrameElement* target) {
   entry_frame_->elements_[index].clear_copied();
   if (target->is_register()) {
-    entry_frame_->register_locations_[target->reg().code()] = index;
+    entry_frame_->set_register_location(target->reg(), index);
   } else if (target->is_copy()) {
     entry_frame_->elements_[target->index()].set_copied();
   }
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JUMP_TARGET_INL_H_