This reverts commit f70e5abf.

Reason for revert: Arm64 build breakage: https://ci.chromium.org/p/v8/builders/ci/V8%20Android%20Arm64%20-%20builder/30710

Original change's description:
> Avoid UTF8 conversion in JSNumberFormat
> 
> Change-Id: Idf4e95e6979adfbca24f8fd213967f821a136d87
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2057930
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#66353}

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

Change-Id: I01300a6eec5cb3f2e97da74744328d58d9e51d14
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2062742Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66354}