The DCHECK seems to fail with MSVC on x86 builds. This CL disables this
DCHECK when map packing isn't enabled until we have a proper fix.

Bug: v8:11748, v8:11624
Change-Id: Iec98d161c5cd2b6a910c29287b54c8e3de017e83
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2878735Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74430}