spirv: Add support for the CL Round instruction

Add a round() implementation that's conformant with the CL spec.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6256>
1 file changed