Spec Text:
https://tc39.es/proposal-temporal/#sec-date.prototype.totemporalinstant

Bug: v8:11544
Change-Id: I65315152333291f76edc05cc41a528912a185d02
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3609214
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80755}