The tier-up check is only needed for instances that currently go
through the interpreter. It is simpler to move the check into the
interpreter's C++ entry point. At that point, when we see a JSRegExp
that should tier-up, we simply return RETRY which will automatically
send us back into runtime where the actual recompilation happens.

Bug: v8:9566
Change-Id: Ib7bb5d21a30bae45d6e14846edd2a47469989b35
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1852125
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64210}