On it's own, this change should be non-functional. This is a preparatory change for https://github.com/llvm/llvm-project/pull/141267 which adds a new form of PARTIAL_REDUCE_*MLA. As noted in the discussion on that review, AArch64 needs a different set of legal and custom types for the PARTIAL_REDUCE_SUMLA variant than the currently existing PARTIAL_REDUCE_UMLA/SMLA.
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