Also remove unused macros from the list.

Bug: v8:9708, v8:6949
Change-Id: Ib90ce7c2c4996b3f8892106a89884d7e83610ca6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2370637Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69540}