Metal: explicitly convert XFB vertex shader to void function Previously, spirv-cross would automatically do this (converting to void function) if shader writes to XFB buffers, however this behavior is changed in latest spirv-cross version. So the rasterization disable must be explicitly specified via spirv-cross’s options now. Bug: chromium:1159974 Change-Id: I9f34e1cd9d2f1386e8a8d030a800fbd7341eb68f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2596914 Commit-Queue: Le Hoang Quyen <le.hoang.q@gmail.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>