Fix VM build.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2055 matching lines @@
     kModifierPos,
     kAsyncClosureBit,
     kAlwaysInlineBit,
     kPolymorphicTargetBit,
     kNumTagBits
   };
 
   COMPILE_ASSERT(
       MethodRecognizer::kNumRecognizedMethods < (1 << kRecognizedTagSize));
   COMPILE_ASSERT(
-      kNumTagBits <= (kBitsPerByte * sizeof(RawFunction::kind_tag_)));
+      kNumTagBits <=
+      (kBitsPerByte * sizeof(static_cast<RawFunction*>(0)->kind_tag_)));
 
   class KindBits :
     public BitField<RawFunction::Kind, kKindTagPos, kKindTagSize> {};  // NOLINT
   class RecognizedBits : public BitField<MethodRecognizer::Kind,
                                          kRecognizedTagPos,
                                          kRecognizedTagSize> {};
   class StaticBit : public BitField<bool, kStaticBit, 1> {};
   class ConstBit : public BitField<bool, kConstBit, 1> {};
   class AbstractBit : public BitField<bool, kAbstractBit, 1> {};
   class VisibleBit : public BitField<bool, kVisibleBit, 1> {};
@@ skipping 5262 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_