Also splits off another funciton get_slice_type_from_desc that will be
used in future commits.
v2: Allow packing factor 2 and packing factor 1 elements be stored in
16-bit integers.
v3: Use glsl_base_type_get_bit_size.
v4: Adjust packing so that a single row fills an entire GRF.
v5: Add comment for get_packing_factor and some other cleanups
there. s/cooperative_matrix/cmat/. Tighten the validation of len in
gt_slice_from_desc. All suggested by Caio.
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25994>
Ian Romanick
a2ded5b26c