Revert "[numfuzz] Remove jitless from flags experiment"

This reverts commit 509995d3.

Reason for revert: want to revert first CL

Original change's description:
> [numfuzz] Remove jitless from flags experiment
> 
> Produces too many spurious errors with tests that normally get
> skipped in jitless variant.
> 
> TBR=clemensb@chromium.org
> 
> No-Try: true
> Change-Id: Iddf0e39e4c454a3b17568ba17a014e8d38922052
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1910107
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#64889}

TBR=machenbach@chromium.org,clemensb@chromium.org,almuthanna@google.com,liviurau@chromium.org

Change-Id: I238323289fd29fec82c58795c2ad829e7c0a073a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1910111Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64894}

tools/testrunner/testproc/fuzzer.py

@@ -16,6 +16,7 @@ EXTRA_FLAGS = [
   (0.1, '--cache=code'),
   (0.1, '--force-slow-path'),
   (0.2, '--future'),
+  (0.1, '--jitless'),
   (0.1, '--liftoff'),
   (0.1, '--minor-mc'),
   (0.2, '--no-analyze-environment-liveness'),