And fix a few issues revealed by this new test. Incidentally, the test
uses removeBreakpoint which was still untested with Liftoff. But as
expected this seems to work out of the box.

R=clemensb@chromium.org

Bug: v8:10321
Change-Id: Ifa4e867737d925ea8c6c9731575a32f3da3e16dc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2106206
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66752}