RAW hazards were being tested for if the layouts were identical, but
that's impossible.

Bug: angleproject:4911
Change-Id: I73f568b1df2cbffe943217e19b115561e48a56c9
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2370862
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>