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

src/arm64/lithium-codegen-arm64.h

 // Copyright 2013 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_ARM64_LITHIUM_CODEGEN_ARM64_H_
 #define V8_ARM64_LITHIUM_CODEGEN_ARM64_H_
 
 #include "src/arm64/lithium-arm64.h"
 
 #include "src/arm64/lithium-gap-resolver-arm64.h"
@@ skipping 96 matching lines @@
 #undef DECLARE_DO
 
  private:
   // Return a double scratch register which can be used locally
   // when generating code for a lithium instruction.
   DoubleRegister double_scratch() { return crankshaft_fp_scratch; }
 
   // Deferred code support.
   void DoDeferredNumberTagD(LNumberTagD* instr);
   void DoDeferredStackCheck(LStackCheck* instr);
+  void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
   void DoDeferredMathAbsTagged(LMathAbsTagged* instr,
                                Label* exit,
                                Label* allocation_entry);
 
   void DoDeferredNumberTagU(LInstruction* instr,
                             LOperand* value,
                             LOperand* temp1,
                             LOperand* temp2);
@@ skipping 318 matching lines @@
 
  protected:
   MacroAssembler* masm() const { return codegen_->masm(); }
 
   LCodeGen* codegen_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_LITHIUM_CODEGEN_ARM64_H_