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

src/codegen.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 497 matching lines @@
   int length = cases->length();
 
   for (int i = 0; i < length; i++) {
     Comment cmnt(masm(), "[ Case clause");
 
     // We may not have a virtual frame if control flow did not fall
     // off the end of the previous case.  In that case, use the start
     // frame.  Otherwise, we have to merge the existing one to the
     // start frame as part of the previous case.
     if (!has_valid_frame()) {
-      RegisterFile non_frame_registers = RegisterAllocator::Reserved();
-      SetFrame(new VirtualFrame(start_frame), &non_frame_registers);
+      RegisterFile empty;
+      SetFrame(new VirtualFrame(start_frame), &empty);
     } else {
       frame_->MergeTo(start_frame);
     }
     masm()->bind(&case_labels[i]);
     VisitStatements(cases->at(i)->statements());
   }
 }
 
 
 bool CodeGenerator::TryGenerateFastCaseSwitchStatement(SwitchStatement* node) {
@@ skipping 105 matching lines @@
 void ArgumentsAccessStub::Generate(MacroAssembler* masm) {
   switch (type_) {
     case READ_LENGTH: GenerateReadLength(masm); break;
     case READ_ELEMENT: GenerateReadElement(masm); break;
     case NEW_OBJECT: GenerateNewObject(masm); break;
   }
 }
 
 
 } }  // namespace v8::internal