New hydrogen instruction to reduce cost of growing an array on keyed stores.

src/arm/lithium-codegen-arm.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM_LITHIUM_CODEGEN_ARM_H_
 #define V8_ARM_LITHIUM_CODEGEN_ARM_H_
 
 #include "src/arm/lithium-arm.h"
 
 #include "src/arm/lithium-gap-resolver-arm.h"
@@ skipping 94 matching lines @@
   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
   void DoDeferredNumberTagIU(LInstruction* instr,
                              LOperand* value,
                              LOperand* temp1,
                              LOperand* temp2,
                              IntegerSignedness signedness);
 
   void DoDeferredTaggedToI(LTaggedToI* instr);
   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
   void DoDeferredStackCheck(LStackCheck* instr);
+  void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
   void DoDeferredAllocate(LAllocate* instr);
   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
                                        Label* map_check, Label* bool_load);
   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
                                    Register result,
                                    Register object,
                                    Register index);
@@ skipping 272 matching lines @@
   LCodeGen* codegen_;
   Label entry_;
   Label exit_;
   Label* external_exit_;
   int instruction_index_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_LITHIUM_CODEGEN_ARM_H_