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nir/linker: pack varyings with different interpolation qualifier

Qiang Yu requested to merge yuq825/mesa:topic/pack-diff-loc-varying into main

Driver like radeonsi load varying in a scalar manner, so prefer to pack varying with different interpolation qualifier into same slot to save space.

But driver like panfrost/bifrost can load varying in vector manner, so prefer to pack varying with same interpolation qualifier. (please correct me if I'm wrong @alyssa)

Driver can add interpolation qualifiers which are able to be packed into same varying slot to pack_varying_options nir option.

Only enable for radeonsi in this MR. Other drivers like i965 and RADV could enable this in following MR if would like to.

v3: also support interpolation type (smooth, noperspective).

v2: switch to use nir option instead of gallium pipe cap.

CC: @jekstrand CC: @bnieuwenhuizen CC: @mareko

Edited by Qiang Yu

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