Use metadata section in nmethod to decide when to deoptimize nmethods after redefinition. This walk includes the Method* in evol_method dependencies because the Method* is added there.

This might deoptimize more things but then we don't have to call clear_inline_caches. [~eosterlund] is trying to remove that.

I don't think this can remove evol_method dependencies. We still have to assert_evol_method to get the Method* in the metadata section. It also seems to be used to check_dependencies:
    // The point of the whole exercise: Is this dep still OK?
    Klass* check_dependency() {
      Klass* result = check_klass_dependency(NULL);
      if (result != NULL) return result;
      return check_call_site_dependency(NULL);
    }

check_klass_dependency has a case for evol_method dependencies.

Also make metadata_do take a closure.