Vulkan: Fix barriers w.r.t sampled->storage image update df415528411f97454e765ff6a83ed1cbc90a7d13 implemented a feature where images are not created with the storage flag until needed. This is a necessary optimization. There were a few misuses of the BufferHelper::onRead/Write helpers that set up the appropriate barriers that this change fixes. Bug: angleproject:3816 Change-Id: I7e62d98b7325f938152a1972f4ebee083ed319c2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1924989 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Xinyi He <xinyi.he@arm.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Sunny Sun <sunny.sun@arm.com>