RegExpPrototypeExecBodyWithoutResult, LoadLastIndex, StoreLastIndex.

Bug: v8:8976
Change-Id: I205d6a02c5a97e8c7e484bea3c9441b433197344
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1913330
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64967}