Vulkan: Tighten up asserts for resource ownership We're not permitted to make accesses to a resource while it's owned by an external instance or API. Add some asserts to verify this. Exempt images on platforms that don't implement external memory barriers. Bug: angleproject:3289 Change-Id: I1de929f6a412bfe5c1b798eaa1dc401bbceb5b7f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2195685 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Michael Spang <spang@chromium.org>