If predictable compilation is requested (via --predictable,
--single-threaded, or --wasm-num-compilation-tasks=0), do compile and
commit one function at a time. This makes function allocation
independent of the timing.

R=ahaas@chromium.org

Bug: v8:9751, v8:9752
Change-Id: I451a436800c19574caa5e03901bd900d80e53eee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1809371Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63884}