The "num_exceptions" field of the control block must be updated before
entering the stack check, because it is used in
"GetCurrentDebugSideTable" to compute the correct indices for the debug
side table.

R=clemensb@chromium.org

Bug: chromium:1199526
Change-Id: I54f1e4244bf84d0a78b47a764fedc83b54758d01
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2831483
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74003}