Don't add code dependencies eagerly for HCheckMaps.

src/arm64/lithium-codegen-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 "arm64/lithium-codegen-arm64.h"
 #include "arm64/lithium-gap-resolver-arm64.h"
 #include "code-stubs.h"
 #include "stub-cache.h"
@@ skipping 2097 matching lines @@
       codegen()->DoDeferredInstanceMigration(instr_, object_);
     }
     Label* check_maps() { return &check_maps_; }
     virtual LInstruction* instr() { return instr_; }
    private:
     LCheckMaps* instr_;
     Label check_maps_;
     Register object_;
   };
 
-  if (instr->hydrogen()->CanOmitMapChecks()) {
-    ASSERT(instr->value() == NULL);
-    ASSERT(instr->temp() == NULL);
+  if (instr->hydrogen()->IsStabilityCheck()) {
+    const UniqueSet<Map>* maps = instr->hydrogen()->maps();
+    for (int i = 0; i < maps->size(); ++i) {
+      AddStabilityDependency(maps->at(i).handle());
+    }
     return;
   }
 
   Register object = ToRegister(instr->value());
   Register map_reg = ToRegister(instr->temp());
 
   __ Ldr(map_reg, FieldMemOperand(object, HeapObject::kMapOffset));
 
   DeferredCheckMaps* deferred = NULL;
-  if (instr->hydrogen()->has_migration_target()) {
+  if (instr->hydrogen()->HasMigrationTarget()) {
     deferred = new(zone()) DeferredCheckMaps(this, instr, object);
     __ Bind(deferred->check_maps());
   }
 
   const UniqueSet<Map>* maps = instr->hydrogen()->maps();
   Label success;
   for (int i = 0; i < maps->size() - 1; i++) {
     Handle<Map> map = maps->at(i).handle();
     __ CompareMap(map_reg, map);
     __ B(eq, &success);
   }
   Handle<Map> map = maps->at(maps->size() - 1).handle();
   __ CompareMap(map_reg, map);
 
   // We didn't match a map.
-  if (instr->hydrogen()->has_migration_target()) {
+  if (instr->hydrogen()->HasMigrationTarget()) {
     __ B(ne, deferred->entry());
   } else {
     DeoptimizeIf(ne, instr->environment());
   }
 
   __ Bind(&success);
 }
 
 
 void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
@@ skipping 3786 matching lines @@
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(deferred->exit());
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal