This reverts commit c9c3ec4c.

Reason for revert: Speculative revert for https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/34616/overview (looks unrelated, but fails consistently since this CL)

Original change's description:
> [intl] Clean up intl_segmenter flag
>
> Intl.Segmenter shipped in m87 and launched.
>
> Bug: v8:11225
> Change-Id: I4213e261e1aea717c1281f19785a8c29ff1bbd8b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2570461
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Reviewed-by: Shu-yu Guo <syg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#71653}

TBR=jkummerow@chromium.org,ftang@chromium.org,syg@chromium.org

Change-Id: Ic1d1b02abb9ae7faa41307eee694bb7e40d0fae2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:11225
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2578979Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71657}