Revert 20348 - "Fix LoadFieldByIndex to take mutable heap-numbers into account."

src/arm64/lithium-arm64.cc

 // Copyright 2013 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 2544 matching lines @@
   LOperand* value = UseRegisterAtStart(instr->value());
   LOperand* map = UseRegister(instr->map());
   LOperand* temp = TempRegister();
   return AssignEnvironment(new(zone()) LCheckMapValue(value, map, temp));
 }
 
 
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegisterAtStart(instr->object());
   LOperand* index = UseRegister(instr->index());
-  LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index);
-  LInstruction* result = DefineSameAsFirst(load);
-  return AssignPointerMap(result);
+  return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegister(instr->function());
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal