This is the only FLAG_minor_mc usage that is not guarded by
#ifdef ENABLE_MINOR_MC.

Change-Id: I54d447ede6a6ab4bbfb6ffbd7674e240d8cc1987
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2260878Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68494}