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aco: SGPR allocation granularity/limits and occupancy estimation improvements

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

This MR makes ACO aware of GFX8/GFX9's increased allocation granularity and GFX10's fixed SGPR allocation and takes LDS into account when calculating Program::num_waves. To help keep pipeline-db useful, it causes ACO to report unrounded vgpr/sgpr counts instead of how much is actually allocated.

It also has some cleanups to deduplicate code and make the XNACK_MASK/FLAT_SCR registers handled a bit better.

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