[maglev] Remove succeed check in concurrent dispatcher

Maglev compilation can currently fail, e.g with unsupported bytecodes.

Bug: v8:7700
Change-Id: I837d69a5f9c27d4dc6fa9d03369f045fb5175d61
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3541921


Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79609}