We ensure now that fuzzers don't produce the f.arguments pattern and
instead replace it with a random variable.

No-Try: true
Bug: chromium:1044942, chromium:1020573
Change-Id: I899985f1a238f36d10fb22f76d93b7d5f444eab1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2051944Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66238}