PPC: Fix EXTSW elimination promoting a subregister operand (#208051) promoteInstr32To64ForElimEXTSW copies operands from the 32-bit instruction verbatim into its promoted 64-bit form. When an operand reads the sub_32 subregister of a 64-bit register, the promoted instruction (which takes a full register) ended up with an illegal subregister use and failed the machine verifier. Drop the sub_32 subregister and use the original full register, which provides the low 32 bits the promoted instruction operates on. This avoids verifier error regressions in a future change. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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