Vulkan: Improve SyncVk::serverWait If sync object has already finished, there is no need to insert pipeline barrier. With this CL, asphalt_9 average frame time reduces from 5.464 ms to 5.268 ms (-3.58%), making it 85% of native GLES (4.49 ms) on pixel 7 pro. Bug: b/277644512 Change-Id: I112ccef0619da3c05cba44066327edc0bb81c366 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4651599 Reviewed-by: Roman Lavrov <romanl@google.com> Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>