PowerPC: Promote 32-bit ops to 64-bit in place for EXTSW elimination (#229054) promoteInstr32To64ForElimEXTSW rebuilt a 32-bit instruction as its 64-bit counterpart (e.g. SRAWI -> SRAWI8) with BuildMI, which adds the opcode's implicit defs, and then copied over the original operands, which already carry them. This produced duplicate, inconsistent defs: %8:g8rc = SRAWI8 killed %7, 8, implicit-def $carry, implicit-def dead $carry The 32-bit and 64-bit opcodes have the same operand layout, so mutate the original instruction with setDesc instead. This keeps the original implicit defs with their dead flags, and also preserves the memoperands and MI flags that rebuilding dropped. The preserved memoperand on a promoted LHA8 allows the scheduler to reorder it with spills in aix-cc-abi.ll. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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