Vulkan: Optimize pipeline desc w.r.t dynamic state State corresponding to VK_EXT_extended_dynamic_state is moved to the back of the description and is excluded from the hash. Bug: angleproject:5906 Change-Id: I3b6efb2674e955eed6e12b6c7096a7fea63748a9 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3651581 Reviewed-by: Yuxin Hu <yuxinhu@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>