Provide a helper to generate multiple Lithium instructions for one Hydrogen instruction.

src/arm64/lithium-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_ARM64_H_
 #define V8_ARM64_LITHIUM_ARM64_H_
 
 #include "hydrogen.h"
 #include "lithium-allocator.h"
 #include "lithium.h"
@@ skipping 3119 matching lines @@
   // instruction.
   LInstruction* MarkAsCall(
       LInstruction* instr,
       HInstruction* hinstr,
       CanDeoptimize can_deoptimize = CANNOT_DEOPTIMIZE_EAGERLY);
 
   LInstruction* AssignPointerMap(LInstruction* instr);
   LInstruction* AssignEnvironment(LInstruction* instr);
 
   void VisitInstruction(HInstruction* current);
+  void AddInstruction(LInstruction* instr, HInstruction* current);
   void DoBasicBlock(HBasicBlock* block);
 
   int JSShiftAmountFromHConstant(HValue* constant) {
     return HConstant::cast(constant)->Integer32Value() & 0x1f;
   }
   bool LikelyFitsImmField(HInstruction* instr, int imm) {
     if (instr->IsAdd() || instr->IsSub()) {
       return Assembler::IsImmAddSub(imm) || Assembler::IsImmAddSub(-imm);
     } else {
       ASSERT(instr->IsBitwise());
@@ skipping 38 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_LITHIUM_ARM64_H_