Use assembly instead of C array literals to link the core snapshot into the VM.

runtime/bin/snapshot_empty.cc

 // Copyright (c) 2011, 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.
 
 // This file is linked into the dart executable when it does not have a
 // snapshot linked into it.
 
 #if defined(_WIN32)
 typedef unsigned __int8 uint8_t;
 #else
 #include <inttypes.h>
 #include <stdint.h>
 #endif
 #include <stddef.h>
 
-namespace dart {
-namespace bin {
-
-const uint8_t* vm_snapshot_data = NULL;
-const uint8_t* vm_snapshot_instructions = NULL;
-const uint8_t* core_isolate_snapshot_data = NULL;
-const uint8_t* core_isolate_snapshot_instructions = NULL;
-
-}  // namespace bin
-}  // namespace dart
+extern "C" {
+const uint8_t* kDartVmSnapshotData = NULL;
+const uint8_t* kDartVmSnapshotInstructions = NULL;
+const uint8_t* kDartCoreIsolateSnapshotData = NULL;
+const uint8_t* kDartCoreIsolateSnapshotInstructions = NULL;
+}