These opcodes are not officially specified yet, they are defined
in the "prototype implementation spec" at https://bit.ly/3cWcm6Q.

Drive-by: drop a unit test whose entire coverage can be provided
by a compile-time check.

Bug: v8:7748
Change-Id: Icefa6dd321802c8a01c4561178b9d21eca1fbaa3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2152841Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67208}