Added to crucial productions that will incur in any infinite recursion:
- In ParsePrimaryExpression
- In all ParseUnaryExpression subrules
- In ParseDoWhileStatement
- In ParseBlock

Change-Id: Iaee295eb5652e57712d029999b36078fea3b7dab
Reviewed-on: https://chromium-review.googlesource.com/c/1290794Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56816}