Remove unnecessary environment from LStoreKeyedFastElements.

src/x64/lithium-x64.cc

 // Copyright 2011 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 1911 matching lines @@
   ASSERT(instr->object()->representation().IsTagged());
   ASSERT(instr->key()->representation().IsInteger32());
 
   LOperand* obj = UseTempRegister(instr->object());
   LOperand* val = needs_write_barrier
       ? UseTempRegister(instr->value())
       : UseRegisterAtStart(instr->value());
   LOperand* key = needs_write_barrier
       ? UseTempRegister(instr->key())
       : UseRegisterOrConstantAtStart(instr->key());
-
-  return AssignEnvironment(new LStoreKeyedFastElement(obj, key, val));
+  return new LStoreKeyedFastElement(obj, key, val);
 }
 
 
 LInstruction* LChunkBuilder::DoStoreKeyedFastDoubleElement(
     HStoreKeyedFastDoubleElement* instr) {
   ASSERT(instr->value()->representation().IsDouble());
   ASSERT(instr->elements()->representation().IsTagged());
   ASSERT(instr->key()->representation().IsInteger32());
 
   LOperand* elements = UseRegisterAtStart(instr->elements());
@@ skipping 295 matching lines @@
   LOperand* key = UseOrConstantAtStart(instr->key());
   LOperand* object = UseOrConstantAtStart(instr->object());
   LIn* result = new LIn(key, object);
   return MarkAsCall(DefineFixed(result, rax), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64