Instead, create only 1 normalized map.

This will benefit ES5-style classes.

Bug: v8:13091
Change-Id: I495ea4a69aedef01b97f4b0d5aad19bb355ce004
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3776692
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82099}