Fix: Skip sanity check of illegal tokens
Additional fix: set c0_ to kEndOfInput

Bug: v8:8363, v8:7926
Change-Id: I4f1222945914462e495d9ed6b86d38e478adbe39
Reviewed-on: https://chromium-review.googlesource.com/c/1304298
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57085}