Without the cast, gcc might throw the following error
during compilation:

error: enumeral mismatch in conditional expression:
'cppgc::internal::StatsCollector::ScopeId' vs
'cppgc::internal::StatsCollector::ConcurrentScopeId'

Change-Id: I95e230310a0cbdc775d63657b8c407a8392a57e3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2551104Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#71325}