[PowerPC] Remove unnecessary FP_EXTENDS from non-compare operand of FSEL. NFCI (#231540) The first operand of PPCISD::FSEL always needs to be f64, but not the second or third operand. Those operands need to match each other and the result type. AI tells me that f32 operands are already held in f64 format so an fp_extend codegens to a copy. Found while adding verification of SDTCisSameAs in SDNodeInfo::verifyNode. Assisted-by: Claude
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