There were only two uses. Replace them by [[noreturn]] directly.

R=jarin@chromium.org
BUG=v8:6474

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I965f74f5b3493cfef9efd698f24bf00216442fd8
Reviewed-on: https://chromium-review.googlesource.com/544845Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46205}