Fix ArrayShift hydrogen support

src/hydrogen-instructions.h

 // Copyright 2012 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_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include "v8.h"
 
 #include "allocation.h"
@@ skipping 7105 matching lines @@
   virtual bool DataEquals(HValue* other) V8_OVERRIDE {
     HArrayShift* that = HArrayShift::cast(other);
     return this->kind_ == that->kind_;
   }
 
  private:
   HArrayShift(HValue* context, HValue* object, ElementsKind kind)
       : kind_(kind) {
     SetOperandAt(0, context);
     SetOperandAt(1, object);
+    SetChangesFlag(kArrayLengths);
     SetChangesFlag(kNewSpacePromotion);
     set_representation(Representation::Tagged());
     if (IsFastSmiOrObjectElementsKind(kind)) {
       SetChangesFlag(kArrayElements);
     } else {
       SetChangesFlag(kDoubleArrayElements);
     }
   }
 
   ElementsKind kind_;
@@ skipping 574 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_