Instead of having sequential compilation implemented as a separate
path, we can just use the existing parallel compilation path, and
restrict the number of parallel compilations (if deterministic
compilation is required).

R=mstarzinger@chromium.org

Bug: v8:9104
Change-Id: Ia12c6e45455834a131b3d2ed55f5fe9132903d8e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1552782
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60740}