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radv: lower variables to ssa before nir_propagate_invariant

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

Variables make the propagation more conservative than it needs to be.

fossil-db (GFX10.3, based on !8056):
Totals from 22102 (15.86% of 139391) affected shaders:
SGPRs: 1103833 -> 1104265 (+0.04%); split: -0.06%, +0.10%
VGPRs: 851316 -> 849396 (-0.23%); split: -0.58%, +0.35%
CodeSize: 34422452 -> 34206052 (-0.63%); split: -0.72%, +0.09%
MaxWaves: 291050 -> 291186 (+0.05%); split: +0.23%, -0.18%
Instrs: 6749188 -> 6662804 (-1.28%); split: -1.37%, +0.09%
Cycles: 63456312 -> 62995828 (-0.73%); split: -0.92%, +0.20%
fossil-db (GFX10.3):
Totals from 841 (0.60% of 139391) affected shaders:
VGPRs: 44444 -> 44500 (+0.13%)
CodeSize: 3985604 -> 3987188 (+0.04%); split: -0.11%, +0.15%
Instrs: 748847 -> 749174 (+0.04%); split: -0.13%, +0.18%
Cycles: 35801628 -> 35825676 (+0.07%); split: -0.23%, +0.30%

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