Vulkan: Implement memory barriers Bug: angleproject:3574 Change-Id: I13d8f4fcd6f1bf9bf3496c91c2c697076e2491bd Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1699005 Reviewed-by: Tobin Ehlis <tobine@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>