- Fix x64 build.

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 1297 matching lines @@
   // Variable length data follows here.
   uint32_t data_[0];
 };
 
 
 class RawInt64Array : public RawByteArray {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Int64Array);
 
   // Variable length data follows here.
   int64_t data_[0];
+
+  friend class Instance;
 };
 
 
 class RawUint64Array : public RawByteArray {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Uint64Array);
 
   // Variable length data follows here.
   uint64_t data_[0];
 };
 
@@ skipping 303 matching lines @@
          kExternalUint64ArrayCid == kExternalInt8ArrayCid + 7 &&
          kExternalFloat32ArrayCid == kExternalInt8ArrayCid + 8 &&
          kExternalFloat64ArrayCid == kExternalInt8ArrayCid + 9 &&
          kStacktraceCid == kExternalInt8ArrayCid + 10);
   return (index >= kExternalInt8ArrayCid && index <= kExternalFloat64ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_