Fix for 7941

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 1291 matching lines @@
   RawSmi* length_;
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->length_); }
 };
 
 
 class RawInt8Array : public RawByteArray {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Int8Array);
 
   // Variable length data follows here.
   int8_t data_[0];
+
+  friend class Object;
 };
 
 
 class RawUint8Array : public RawByteArray {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Uint8Array);
 
   // Variable length data follows here.
   uint8_t data_[0];
 };
 
@@ skipping 378 matching lines @@
          kExternalUint64ArrayCid == kExternalInt8ArrayCid + 8 &&
          kExternalFloat32ArrayCid == kExternalInt8ArrayCid + 9 &&
          kExternalFloat64ArrayCid == kExternalInt8ArrayCid + 10 &&
          kStacktraceCid == kExternalInt8ArrayCid + 11);
   return (index >= kExternalInt8ArrayCid && index <= kExternalFloat64ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_