Also remove a comment referring to using the macro.

Bug: v8:11074
Change-Id: Ib56a0360b28812833b372738f4956ef41c59a97b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2557058Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71388}