[unified-heap] Fix liveness in locks/chromium-waiting-promise-gc.html

Bug: chromium:843903
Change-Id: If313be18bdb7e0ca4c40c7ffb368df44634e1cf1
Reviewed-on: https://chromium-review.googlesource.com/1242467
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593901}
1 file changed