[crankshaft] Remove the useless HCallStub instruction.

src/crankshaft/arm64/lithium-arm64.cc

 // 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.
 
 #include "src/crankshaft/arm64/lithium-arm64.h"
 
 #include <sstream>
 
 #include "src/crankshaft/arm64/lithium-codegen-arm64.h"
 #include "src/crankshaft/hydrogen-osr.h"
@@ skipping 1066 matching lines @@
   return MarkAsCall(DefineFixed(result, x0), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
   return MarkAsCall(DefineFixed(new(zone()) LCallRuntime(context), x0), instr);
 }
 
 
-LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
-  LOperand* context = UseFixed(instr->context(), cp);
-  return MarkAsCall(DefineFixed(new(zone()) LCallStub(context), x0), instr);
-}
-
-
 LInstruction* LChunkBuilder::DoCapturedObject(HCapturedObject* instr) {
   instr->ReplayEnvironment(current_block_->last_environment());
 
   // There are no real uses of a captured object.
   return NULL;
 }
 
 
 LInstruction* LChunkBuilder::DoChange(HChange* instr) {
   Representation from = instr->from();
@@ skipping 1606 matching lines @@
   LOperand* context = UseFixed(instr->context(), cp);
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, cp), instr);
 }
 
 
 }  // namespace internal
 }  // namespace v8