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radv: remove exports without color attachment or writemask

Daniel Schürmann requested to merge daniel-schuermann/mesa:radv_remove_null_exports into main

This lets us make use of NIR's more advanced DCE. This includes removing of CF constructs, PS inputs and VS outputs.

Totals from 1959 (1.45% of 134913) affected shaders: (GFX10.3)
VGPRs: 73464 -> 71944 (-2.07%); split: -3.79%, +1.72%
SpillSGPRs: 6 -> 0 (-inf%)
CodeSize: 4860324 -> 4675248 (-3.81%); split: -4.92%, +1.11%
LDS: 2619904 -> 2781696 (+6.18%); split: -0.37%, +6.55%
MaxWaves: 50614 -> 50852 (+0.47%); split: +1.63%, -1.16%
Instrs: 924233 -> 887836 (-3.94%); split: -5.01%, +1.07%
Latency: 5635532 -> 5418083 (-3.86%); split: -4.53%, +0.67%
InvThroughput: 1107764 -> 1077542 (-2.73%); split: -3.44%, +0.71%
VClause: 17361 -> 16163 (-6.90%); split: -8.38%, +1.47%
SClause: 31886 -> 29323 (-8.04%); split: -8.52%, +0.48%
Copies: 53529 -> 52127 (-2.62%); split: -5.30%, +2.68%
Branches: 22993 -> 22802 (-0.83%); split: -3.44%, +2.61%
PreSGPRs: 53123 -> 51395 (-3.25%); split: -3.60%, +0.35%
PreVGPRs: 59699 -> 57424 (-3.81%); split: -5.13%, +1.32%

Sometimes, the lower number of VS outputs makes RADV create culling shaders with increased code size.

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