This reverts commit 679c373e.

Reason for revert: DCHECK failures in post_job.cc when running Chromium gtests, blocking V8 roll into Chromium.
See https://ci.chromium.org/ui/p/chromium/builders/try/mac-rel/928210/overview for example failures/stacks.

Original change's description:
> Reland "heap: Force incremental marking in C++ only workloads"
>
> This is a reland of 4fde3328
>
> Another Blink-related test fix landed, see chromium:1300492.
>
> Original change's description:
> > heap: Force incremental marking in C++ only workloads
> >
> > ... when above a certain minimum threshold. This is to guard against
> > memory running away in scenarios where the JS heap is empty and
> > there's only high throughput C++ allocations that don't allow for a
> > memory reducer GC to kick in.
> >
> > This logic should be revisited after Oilpan's young generation
> > collector is implemented which may allow switching to a more efficient
> > shrinking strategy for initial heap setup.
> >
> > Bug: chromium:1029379, chromium:1300028, chromium:1300492
> > Change-Id: I93924fc2fe77d6226c29358d3afb1cc9d6fbf3b1
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3484319
> > Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> > Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#79255}
>
> Bug: chromium:1029379, chromium:1300028, chromium:1300492
> Change-Id: Ida66e0c944094472b4856d5fecef2d199d29549b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3487991
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79281}

Bug: chromium:1029379, chromium:1300028, chromium:1300492
Change-Id: Ifbdcf996a91cbdb5cce3b07059c333a7f1a9444a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3491187
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79294}