Support for taking full snapshots from 'dart', not just 'dart_bootstrap'.

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 10658 matching lines @@
   intptr_t hash_value = url.Hash() & hash_mask;
 
   const GrowableObjectArray& libs = GrowableObjectArray::Handle(zone,
       isolate->object_store()->libraries());
   intptr_t sequence_value = libs.Length();
 
   char private_key[32];
   OS::SNPrint(private_key, sizeof(private_key),
               "%c%" Pd "%06" Pd "",
               kPrivateKeySeparator, sequence_value, hash_value);
-  StorePointer(&raw_ptr()->private_key_, String::New(private_key, Heap::kOld));
+  const String& key = String::Handle(zone, String::New(private_key,
+                                                       Heap::kOld));
+  key.Hash();  // This string may end up in the VM isolate.
+  StorePointer(&raw_ptr()->private_key_, key.raw());
 }
 
 
 const String& Library::PrivateCoreLibName(const String& member) {
   const Library& core_lib = Library::Handle(Library::CoreLibrary());
   const String& private_name = String::ZoneHandle(core_lib.PrivateName(member));
   return private_name;
 }
 
 
@@ skipping 11762 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart