Vulkan: Tighten descriptor stage usage hints Per-stage uniform buffers are marked with the specific stage. Program uniform buffers and images are specified to be used in all graphics stages. Descriptors used in internal shaders are marked for use in either compute or fragment stages. Bug: angleproject:3220 Change-Id: Ifcac36a1224f0392ba5fba50660514e498256401 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1595439 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tobin Ehlis <tobine@google.com>