Vulkan: Fix issue with texsubimage2d barriers Also re-enable the Windows AMD tests that were suppressed because of that bug. Bug: angleproject:2492 Change-Id: Ie9b5eb4c5705bbb390c3899fe4c66d3e47eff00d Reviewed-on: https://chromium-review.googlesource.com/1026461 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>