We only need to report once that we're in an invalid path for binding patterns
and arrow formals.

Change-Id: I8c7edc1c2a9f431c98e09725d0534e661db76634
Reviewed-on: https://chromium-review.googlesource.com/c/1276626
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56579}