The current logic sometimes skips the request for a code logging stack
guard request, even though no such request is pending. This happens if
the previous stack guard already executed, but a foreground task is
still pending.
This CL fixes this by re-requesting a stack guard interrupt when the
first code is added to the vector of outstanding code to be logged.

Plus minor drive-by fix.

R=mstarzinger@chromium.org

Bug: v8:9163
Change-Id: I4937f3983f15e7122141b04ddb1432cd1f78828b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1578461
Auto-Submit: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60970}