[parser] Remove RETURN_IF* part 12

Bug: v8:8363, v8:7926
Change-Id: I60df70bcd1bc12b0cffe760532d92fa3e1fe7da2
Reviewed-on: https://chromium-review.googlesource.com/c/1307420Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57122}