The names of all shared classes must also be a shared Symbol. If name->is_shared() == false, the following lookup will always fail:

http://hg.openjdk.java.net/jdk/jdk/file/5b5de2618756/src/hotspot/share/classfile/systemDictionaryShared.cpp#l1415
const RunTimeSharedClassInfo*

SystemDictionaryShared::find_record(RunTimeSharedDictionary* dict, Symbol* name) {
  if (UseSharedSpaces) {
    unsigned int hash = primitive_hash<Symbol*>(name);
    return dict->lookup(name, hash, 0);
  } else {
    return NULL;
  }
}

To improve loading time of non-shared classes, we should avoid doing the hashtable lookup, if name->is_shared() == false.