ECMA402 decided to abandon https://github.com/tc39/ecma402/pull/345
so we should remove the code here.

Bug: v8:9282
Change-Id: I05cbad429ae01bf3debebfed07160b5f53f98a21
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1825827
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64004}