This flag has been on, but was disabled for the reland of the control
flow aware register allocator (currently behind a flag).

Change-Id: I4a6aabd0c2a10160ef9bd96372fc5c72096d5369
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1532079Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60371}