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nv30: Switch to using NIR-to-TGSI by default.

Emma Anholt requested to merge anholt/mesa:nv30-nir into main 
    nv30/40: Switch to using NIR-to-TGSI by default.
    
    shader-db results for nv30 (note that we expect many more loops unrolled,
    so instr count is probably understating the win):
    
    nv30:
    total instructions in shared programs: 16535069 -> 14299105 (-13.52%)
    instructions in affected programs: 16377286 -> 14141322 (-13.65%)
    total gpr in shared programs: 81255 -> 67268 (-17.21%)
    gpr in affected programs: 56714 -> 42727 (-24.66%)
    LOST:   0
    GAINED: 824
    
    nv40:
    total instructions in shared programs: 20907673 -> 18428749 (-11.86%)
    instructions in affected programs: 20755510 -> 18276586 (-11.94%)
    total gpr in shared programs: 104200 -> 82831 (-20.51%)
    gpr in affected programs: 80278 -> 58909 (-26.62%)
Edited by Emma Anholt

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