This CL adds partial support for objects whose slow mode dictionaries
are OrderedNameDictionaries. This is the case for all slow mode objects
if V8_DICT_MODE_PROTOTYPES is enabled.

In particular, this part deals with those runtime functions called by
the DefineClass builtin, located in literal-objects.cc and
runtime-classes.cc.

Bug: v8:7569
Change-Id: Ie4c479fd6f8872eea9f190590408a4aafd1c77e6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2523321
Commit-Queue: Frank Emrich <emrich@google.com>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71205}