Numeric separators are not allowed in NonOctalDecimalIntegerLiterals.

Bug: v8:9437
Change-Id: Ic62b35b361de36fc622e207c140c365665021029
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1722194
Commit-Queue: Joshua Litt <joshualitt@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62994}