Move the translation array building to the "compile" rather than
"generate code" phase of maglev compilation, as a graph processor after
register allocation. This allows it to be done on a background thread.

Drive-by: Use the new OptimizedOut functionality of the translation
array builder.

Bug: v8:7700
Change-Id: If4202737f1eeb38281f306c23f408105c5fb0ef1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3811501Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82228}