Add a SerializedCodeData constructor which skips all sanity checks aside
from the source hash check, to be used after off-thread deserialization
(which does these other checks already). In particular, this skips doing
the checksum again, which would otherwise require a second walk over the
serialized data.

This requires saving the off-thread sanity check result (in the case of
a failure), since it is no longer recomputed.

Change-Id: I664c309c9cb8dca94a74b4293c84ceb353f37ed4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3240402
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77537}