There is a bug in the way the Vulkan backend handles image respecification. Add 2 tests that expose this bug - 1. When texture format is swizzled it needs to destroy only the read image views 2. When texture is respecified using external images the FramebufferVk cache has a bug where it doesn't invalidate the object with the orphaned attachment Bug: angleproject:4651 Test: angle_end2end_tests.exe --gtest_filter=ImageRespecificationTest* Change-Id: Id564a700ea44eb4f804694613f597320ea811c07 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2246532 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>