GCTracer::Scope and GCTracer::Event shadow GarbageCollector's
MARK_COMPACTOR, etc.

Bug: v8:12244, v8:12245
Change-Id: Ibe60fb03ba35c9a9e057cadc7b8f557d9db9437f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3182226
Auto-Submit: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77076}