Vulkan: Output buffer memory barrier in graph dump Bug: angleproject:3205 Change-Id: Id8c1de49d2201ea331e5f5223c88144db5fadbb3 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1665354 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>