Avoid the lookup via heap()->incremental_marking() and instead cache
the marking state on GlobalHandles itself.

Change-Id: I2665681ad38983bf16d22e0a82dd10743877e520
Bug: chromium:1294661
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3468903Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79138}