Fix RawObject::IsVMHeapObject to use Contains instead of relying on the mark bit.

runtime/vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 358 matching lines @@
   void Validate(Isolate* isolate) const;
   intptr_t VisitPointers(ObjectPointerVisitor* visitor);
   bool FindObject(FindObjectVisitor* visitor);
 
   static RawObject* FromAddr(uword addr) {
     // We expect the untagged address here.
     ASSERT((addr & kSmiTagMask) != kHeapObjectTag);
     return reinterpret_cast<RawObject*>(addr + kHeapObjectTag);
   }
 
-  static uword ToAddr(RawObject* raw_obj) {
+  static uword ToAddr(const RawObject* raw_obj) {
     return reinterpret_cast<uword>(raw_obj->ptr());
   }
 
   static bool IsCreatedFromSnapshot(intptr_t value) {
     return CreatedFromSnapshotTag::decode(value);
   }
 
   static bool IsCanonical(intptr_t value) {
     return CanonicalObjectTag::decode(value);
   }
@@ skipping 1323 matching lines @@
   // Make sure this is updated when new TypedData types are added.
   ASSERT(kTypedDataInt8ArrayViewCid == kTypedDataInt8ArrayCid + 12);
   ASSERT(kExternalTypedDataInt8ArrayCid == kTypedDataInt8ArrayViewCid + 13);
   ASSERT(kNullCid == kExternalTypedDataInt8ArrayCid + 12);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_