Remove dead code and move a condition earlier, as discussed in
http://doc/1I1yzlXM79M7W5QfVjTwSSTEQsRCjdfo8cgSQXkeqlZQ#heading=h.e7x2k9l4bmi7

Bug: v8:9183
Change-Id: Iaba7233e47ee19d2be5501ce6046f3956532513c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1658155
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Auto-Submit: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62157}