[AMDGPU][True16][CodeGen] stop emitting spgr_lo16 from isel (#144819) When true16 is enabled, isel start to emit sgpr_lo16 register when a trunc/sext i16/i32 is generated, or a salu32 is used by vgpr16 or vice versa. And this causes a problem as sgpr_lo16 is not fully supported in the pipeline. True16 mode works fine in -O3 mode since folding pass remove sgpr_lo16 from the pipeline. However it hit a problem in -O0 mode as folding pass is skipped. This patch did: 1. stop emitting sgpr_lo16 from isel 2. update codegen pattern to split uniformed/divergent pattern for i16/i32 conversion 3. update fix-sgpr-copy pass to address legalization requirement in true16 mode, update fix-sgpr-copies-f16-true16.mir test to include all possible combinations This patch is tested with cts and downstream repo with -O0 testing
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