Execute foreground tasks triggered by the {CompilationStateCallback}
via the {CompileStep} mechanism of {AsyncCompileJob} such that they get
cancelled when the AsyncCompileJob dies.

R=ahaas@chromium.org

Bug: chromium:938311
Change-Id: I2082f93f47988c014c8dee3ddf3e9b2940f6f531
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1507674Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60082}