This is try to reduce the number of vkCmdPipelineBarrier API calls into
driver. It should not affect the actual barriers.

Bug: b/155341891
Change-Id: I57b8b8cdad50d494c76a008006bd54961170c8bc
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2194841
Commit-Queue: Charlie Lao <cclao@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>