nir/lower_input_attachments: lower nir_texop_fragment_{mask}_fetch

These instructions are allowed to fetch from multisampled
subpass input attachments.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3304>
1 file changed