[AMDGPU] Update target helpers & GCNSchedStrategy for dynamic VGPRs (#130047) In dynamic VGPR mode, we can allocate up to 8 blocks of either 16 or 32 VGPRs (based on a chip-wide setting which we can model with a Subtarget feature). Update some of the subtarget helpers to reflect this. In particular: - getVGPRAllocGranule is set to the block size - getAddresableNumVGPR will limit itself to 8 * size of a block We also try to be more careful about how many VGPR blocks we allocate. Therefore, when deciding if we should revert scheduling after a given stage, we check that we haven't increased the number of VGPR blocks that need to be allocated. --------- Co-authored-by: Jannik Silvanus <jannik.silvanus@amd.com>
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