We also change pipeline-statistics.cc to use a combination of turbofan-
related categories since that more accurately reflects the emitted events.

TBR=bmeurer@chromium.org

Bug: chromium:1084929
Change-Id: I85dcd89ab3e4cd95df3ae9791d158b4ab6c00829
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2599749
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71853}