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

src/arm/register-allocator-arm.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 31 matching lines @@
 
 
 void Result::ToRegister(Register target) {
   UNIMPLEMENTED();
 }
 
 
 // -------------------------------------------------------------------------
 // RegisterAllocator implementation.
 
-RegisterFile RegisterAllocator::Reserved() {
-  RegisterFile reserved;
-  reserved.Use(sp);
-  reserved.Use(fp);
-  reserved.Use(cp);
-  reserved.Use(pc);
-  return reserved;
-}
-
-
-void RegisterAllocator::UnuseReserved(RegisterFile* register_file) {
-  register_file->ref_counts_[sp.code()] = 0;
-  register_file->ref_counts_[fp.code()] = 0;
-  register_file->ref_counts_[cp.code()] = 0;
-  register_file->ref_counts_[pc.code()] = 0;
-}
-
-
-bool RegisterAllocator::IsReserved(int reg_code) {
-  return (reg_code == sp.code())
-      || (reg_code == fp.code())
-      || (reg_code == cp.code())
-      || (reg_code == pc.code());
-}
-
-
-void RegisterAllocator::Initialize() {
-  Reset();
-  // The following registers are live on function entry, saved in the
-  // frame, and available for allocation during execution.
-  Use(r1);  // JS function.
-  Use(lr);  // Return address.
-}
-
-
-void RegisterAllocator::Reset() {
-  registers_.Reset();
-  // The following registers are live on function entry and reserved
-  // during execution.
-  Use(sp);  // Stack pointer.
-  Use(fp);  // Frame pointer (caller's frame pointer on entry).
-  Use(cp);  // Context context (callee's context on entry).
-  Use(pc);  // Program counter.
-}
-
-
 Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
-  UNIMPLEMENTED();
+  // No byte registers on ARM.
+  UNREACHABLE();
   return Result();
 }
 
 
 } }  // namespace v8::internal