Remove scratch register requirement from LoadInstanceDescriptors on arm and mips.

src/arm/lithium-arm.cc

 // Copyright 2012 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 2276 matching lines @@
 
 LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
   LOperand* object = UseFixed(instr->enumerable(), r0);
   LForInPrepareMap* result = new(zone()) LForInPrepareMap(object);
   return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
 }
 
 
 LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
   LOperand* map = UseRegister(instr->map());
-  LOperand* scratch = TempRegister();
-  return AssignEnvironment(DefineAsRegister(
-      new(zone()) LForInCacheArray(map, scratch)));
+  return AssignEnvironment(DefineAsRegister(new(zone()) LForInCacheArray(map)));
 }
 
 
 LInstruction* LChunkBuilder::DoCheckMapValue(HCheckMapValue* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
   LOperand* map = UseRegisterAtStart(instr->map());
   return AssignEnvironment(new(zone()) LCheckMapValue(value, map));
 }
 
 
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseRegister(instr->index());
   return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal