This reverts commit 8b6fd147.

This adds --no-stress-flush-bytecode to the failing assertOptimized test as the flag changed the GC pattern and was deoptimizing code.

Original change's description:
> Revert "[regexp] Ship RegExp match indices"
>
> This reverts commit 72464122.
>
> Reason for revert:
> https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20gc%20stress/32046
>
> Original change's description:
> > [regexp] Ship RegExp match indices
> >
> > I2S:
> > https://groups.google.com/a/chromium.org/g/blink-dev/c/RR_dw_ZXtT0/m/xtgu5jjyAQAJ
> >
> > Bug: v8:9548
> > Change-Id: I8ccf2f4c38f9b9204ae47162303f21d2d44498e8
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2682508
> > Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> > Auto-Submit: Shu-yu Guo <syg@chromium.org>
> > Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#72571}
>
> TBR=jgruber@chromium.org,syg@chromium.org
>
> Change-Id: I1173389082928aa5c9895ca4fb360c7ab8ec073b
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: v8:9548
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2681943
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72576}

TBR=machenbach@chromium.org,jgruber@chromium.org,syg@chromium.org

# Not skipping CQ checks because this is a reland.

Bug: v8:9548
Change-Id: Ie18b16f347061602f35e3dea371c03d2ae136127
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2686098
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72613}