Vulkan: Follow up change to optimize number of condition checks This is a follow up of a comment on this CL: https://chromium-review.googlesource.com/c/angle/angle/+/985954 Bug: angleproject:2442 Change-Id: Id104c1437d77e6102b94351623ee8538a1d6c3d7 Reviewed-on: https://chromium-review.googlesource.com/996012 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Luc Ferron <lucferron@chromium.org>