Should reduce the binary size bloat from the perfect hashing. Local
testing on Windows shows a significant size reduction.

Bug: chromium:998535
Change-Id: I411cc5a917036d2239d15353d760f44e40faa26c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1814725
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>