[AArch64] Add custom lowering of nxv32i1 get.active.lane.mask nodes (#141969) performActiveLaneMaskCombine already tries to combine a single get.active.lane.mask where the low and high halves of the result are extracted into a single whilelo which operates on a predicate pair. If the get.active.lane.mask node requires splitting, multiple nodes are created with saturating adds to increment the starting index. We cannot combine these into a single whilelo_x2 at this point unless we know the add will not overflow. This patch adds custom lowering for the node if the return type is nxv32xi1, as this can be replaced with a whilelo_x2 using legal types. Anything wider than nxv32i1 will still require splitting first.
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