[turbofan] Remove redundant or bogus comments from verifier

Change-Id: Icc86a805d1eef8c3c805f956d805c43923e6422b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2007504
Auto-Submit: Georg Neis <neis@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65870}