Translator: Optimize size calculation for variable arrays Bug: angleproject:373924024 Change-Id: Id3a8b844b8274c19c0c2c833842fb8b501f50174 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6004338 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>