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nir: improve divergence analysis for loads with non-uniform resources

Rhys Perry requested to merge pendingchaos/mesa:nir_da_nonuniform_resource into master

If ACCESS_NON_UNIFORM is not specified, we can assume the resource is uniform. This requires nir_lower_non_uniform_access to remove that flag.

A few Detroit: Become Human shaders use a index sourced from a fragment input which is expected to be uniform.

shader-db (Navi):

Totals from 8 (0.01% of 127638) affected shaders:
SGPRs: 224 -> 384 (+71.43%)
VGPRs: 208 -> 112 (-46.15%)
CodeSize: 5360 -> 5344 (-0.30%); split: -1.49%, +1.19%
Instrs: 1036 -> 1028 (-0.77%); split: -1.93%, +1.16%
VMEM: 1320 -> 608 (-53.94%)
SMEM: 384 -> 336 (-12.50%); split: +14.58%, -27.08%
VClause: 24 -> 16 (-33.33%)
SClause: 48 -> 56 (+16.67%)
PreSGPRs: 124 -> 216 (+74.19%)
PreVGPRs: 168 -> 88 (-47.62%)

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