This reverts commit 121d624b.

Reason for revert:
Causes many differential-fuzzing false positives in the current state.

Original change's description:
> Make more runtime functions available to the fuzzers
>
> Previously, we had an explicit allow-list of runtime functions for
> fuzzing, and every function that should be available to fuzzers needed
> to be added to that. This approach is somewhat fragile, however, as it
> is easy to forget adding new functions to that list. With this CL, all
> runtime functions that are used for testing are automatically exposed to
> fuzzers, but can be manually opted out, which is still necessary for
> some functions for a number of reasons.
>
> This CL also makes a number of test functions fuzzer safe, as those are
> now exposed to fuzzers. There will likely be a few more functions that
> were missed and are not yet fully fuzzer-compatible. However, those
> should quickly be identified by our fuzzers, at which point they can
> either be made fuzzing-compatible or opted-out of fuzzing.
>
> Bug: 353685107
> Change-Id: Ibae038fee2926205bcbc91a8bcadcaec9a8242a1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/5720570


> Reviewed-by: Matthias Liedtke <mliedtke@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Samuel Groß <saelo@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#95126}

Bug: 353685107
Change-Id: I09af6688122055a89a999d9c201d9bf0f718e558
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/5725914
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#95140}