A64: Port recent ARM optimizations in LCodeGen::DoAccessArgumentsAt.

src/a64/lithium-a64.h

 // 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 523 matching lines @@
  public:
   LOsrEntry() {}
 
   virtual bool HasInterestingComment(LCodeGen* gen) const V8_OVERRIDE {
     return false;
   }
   DECLARE_CONCRETE_INSTRUCTION(OsrEntry, "osr-entry")
 };
 
 
-class LAccessArgumentsAt V8_FINAL : public LTemplateInstruction<1, 3, 1> {
+class LAccessArgumentsAt V8_FINAL : public LTemplateInstruction<1, 3, 0> {
  public:
   LAccessArgumentsAt(LOperand* arguments,
                      LOperand* length,
-                     LOperand* index,
-                     LOperand* temp) {
+                     LOperand* index) {
     inputs_[0] = arguments;
     inputs_[1] = length;
     inputs_[2] = index;
-    temps_[0] = temp;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(AccessArgumentsAt, "access-arguments-at")
 
   LOperand* arguments() { return inputs_[0]; }
   LOperand* length() { return inputs_[1]; }
   LOperand* index() { return inputs_[2]; }
-  LOperand* temp() { return temps_[0]; }
 
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 };
 
 
 class LAddE V8_FINAL : public LTemplateInstruction<1, 2, 0> {
  public:
   LAddE(LOperand* left, LOperand* right) {
     inputs_[0] = left;
     inputs_[1] = right;
@@ skipping 2394 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_LITHIUM_A64_H_