Remove register counts from VirtualFrame, use register indices instead.

src/register-allocator.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 89 matching lines @@
 
 
 Result RegisterAllocator::Allocate(Register target) {
   // If the target is not referenced, it can simply be allocated.
   if (!is_used(target)) {
     return Result(target, cgen_);
   }
   // If the target is only referenced in the frame, it can be spilled and
   // then allocated.
   ASSERT(cgen_->has_valid_frame());
-  if (count(target) == cgen_->frame()->register_count(target)) {
+  if (cgen_->frame()->is_used(target) && count(target) == 1)  {
     cgen_->frame()->Spill(target);
     ASSERT(!is_used(target));
     return Result(target, cgen_);
   }
   // Otherwise (if it's referenced outside the frame) we cannot allocate it.
   return Result(cgen_);
 }
 
 
 } }  // namespace v8::internal