Move symbol table from per isolate snapshot to vm isolate snapshot, this reduces the per isolate in…

runtime/bin/snapshot_in.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 has 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 {
 
 // The string on the next line will be filled in with the contents of the
 // generated snapshot binary file for the vm isolate.
 // This string forms the content of a vm isolate snapshot which is loaded
 // into the vm isolate.
 static const uint8_t vm_isolate_snapshot_buffer_[] = {
-  0,
   %s
 };
 const uint8_t* vm_isolate_snapshot_buffer = vm_isolate_snapshot_buffer_;
 
 
 // The string on the next line will be filled in with the contents of the
 // generated snapshot binary file for a regular dart isolate.
 // This string forms the content of a regular dart isolate snapshot which is
 // loaded into an isolate when it is created.
 static const uint8_t isolate_snapshot_buffer_[] = {
   %s
 };
 const uint8_t* isolate_snapshot_buffer = isolate_snapshot_buffer_;
 
 }  // namespace bin
 }  // namespace dart