Don't add code dependencies eagerly for HCheckMaps.

src/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 "v8.h"
 
 #include "lithium-allocator-inl.h"
 #include "arm64/lithium-arm64.h"
 #include "arm64/lithium-codegen-arm64.h"
 #include "hydrogen-osr.h"
@@ skipping 1151 matching lines @@
 
 LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
   LOperand* temp = TempRegister();
   LInstruction* result = new(zone()) LCheckInstanceType(value, temp);
   return AssignEnvironment(result);
 }
 
 
 LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
-  LOperand* value = NULL;
-  LOperand* temp = NULL;
-  if (!instr->CanOmitMapChecks()) {
-    value = UseRegisterAtStart(instr->value());
-    temp = TempRegister();
-    if (instr->has_migration_target()) info()->MarkAsDeferredCalling();
-  }
-  LInstruction* result = new(zone()) LCheckMaps(value, temp);
-  if (!instr->CanOmitMapChecks()) {
-    result = AssignEnvironment(result);
-    if (instr->has_migration_target()) result = AssignPointerMap(result);
+  if (instr->IsStabilityCheck()) return new(zone()) LCheckMaps;
+  LOperand* value = UseRegisterAtStart(instr->value());
+  LOperand* temp = TempRegister();
+  LInstruction* result = AssignEnvironment(new(zone()) LCheckMaps(value, temp));
+  if (instr->HasMigrationTarget()) {
+    info()->MarkAsDeferredCalling();
+    result = AssignPointerMap(result);
   }
   return result;
 }
 
 
 LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
   LInstruction* result = new(zone()) LCheckNonSmi(value);
   if (!instr->value()->IsHeapObject()) result = AssignEnvironment(result);
   return result;
@@ skipping 1365 matching lines @@
 
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegister(instr->function());
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal