AMDGPU/GlobalISel: add AMDGPUGlobalISelDivergenceLowering pass (#75340) Add empty AMDGPUGlobalISelDivergenceLowering pass. This pass will implement - selection of divergent i1 phis as lane mask phis, requires lane mask merging in some cases - lower uses of divergent i1 values outside of the cycle using lane mask merging - lowering of all cases of temporal divergence: - lower uses of uniform i1 values outside of the cycle using lane mask merging - lower uses of uniform non-i1 values outside of the cycle using a copy to vgpr inside of the cycle Add very detailed set of regression tests for cases mentioned above. patch 1 from: https://github.com/llvm/llvm-project/pull/73337
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