Support the various combinations of arch-mode-target that gm.py
understands, and also completion of cctests.

Bug: v8:11567
No-Try: true
Change-Id: I05285a93253f4225889e949890f5352bbc173c91
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2774708
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73639}