Fix for issue 7089 (Symbols::New was not quite working correctly

vm/raw_object_snapshot.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/bigint_operations.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/symbols.h"
 #include "vm/visitor.h"
@@ skipping 1599 matching lines @@
                           Snapshot::Kind kind) {
   ASSERT(reader != NULL);
   if (RawObject::IsCanonical(tags)) {
     // Set up canonical string object.
     ASSERT(reader != NULL);
     CharacterType* ptr =
         Isolate::Current()->current_zone()->Alloc<CharacterType>(len);
     for (intptr_t i = 0; i < len; i++) {
       ptr[i] = reader->Read<CharacterType>();
     }
-    *str_obj ^= Symbols::New(ptr, len);
+    *str_obj ^= Symbols::NewSymbol(ptr, len);
   } else {
     // Set up the string object.
     *str_obj = StringType::New(len, HEAP_SPACE(kind));
     str_obj->set_tags(tags);
     str_obj->SetHash(0);  // Will get computed when needed.
     for (intptr_t i = 0; i < len; i++) {
       *StringType::CharAddr(*str_obj, i) = reader->Read<CharacterType>();
     }
   }
 }
@@ skipping 579 matching lines @@
   // Write out the class and tags information.
   writer->WriteIndexedObject(kWeakPropertyCid);
   writer->WriteIntptrValue(writer->GetObjectTags(this));
 
   // Write out all the other fields.
   writer->Write<RawObject*>(ptr()->key_);
   writer->Write<RawObject*>(ptr()->value_);
 }
 
 }  // namespace dart