Work around a spell checker NOTREACHED hit

As the reason for hitting the NOTREACHED is unclear at the moment, this
patch works around it by:
- Deactivating the spell checker to prevent further damages in
  prod builds
- Logging the spellchecker state in NOTREACHED() and also with a crash
  key to help further investigation

Bug: 1424540
Change-Id: I5b81b156b3189f667809acb96c1350e7b8a9f671
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4355095
Auto-Submit: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1120244}