Sync the implementation with the latest version of https://github.com/tc39/ecma402/pull/347

Bug: v8:10692
Change-Id: I4e2144da9f770607b4d79e7ce32f079dd2eef54c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2290627Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68827}