Vulkan: Line loop edge case with ubyte indices Bug: angleproject:2637 Change-Id: I2cec129ed1aa0e55e0dbf1d353caa65a51c528a3 Reviewed-on: https://chromium-review.googlesource.com/1096017 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>