Complicated CFG and lots of SALU can cause this to take an extremely long time to finish.
Fixes dEQP-VK.graphicsfuzz.cov-value-tracking-selection-dag-negation-clamp-loop and Monster Hunter Rise demo compile times.
fossil-db (gfx1100):
Totals from 57 (0.04% of 134574) affected shaders:
Instrs: 170919 -> 171165 (+0.14%)
CodeSize: 860144 -> 861128 (+0.11%)
Latency: 961466 -> 961505 (+0.00%)
InvThroughput: 127598 -> 127608 (+0.01%)