We got a TSAN
warning because of the non-atomic store of the code pointer in
a JSFunction in the interpreter builtin (when the pointer is
discovered in the FeedbackVector). However, we know this store is
safe because we guarantee a release store into the
FeedbackVector. However, TSAN can't recognize this interesting
triple relation. Therefore, we mark the fields we need to read
from TurboFan as relaxed.

Bug: v8:11501, v8:7790
Change-Id: I20652216294db540bf9c20e5067a6362fea07dc3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2721762Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73098}