Just set the flag --use-osr to false by default.
If it's set to true on the command line, then it'll be on.

I'd like to get some performance metrics on various tests spread
throughout our performance bot infrastructure.

Change-Id: I1ebc33264505af080901e531dca625452880f81b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1558089Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60693}