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a1e359b64a
ZIP1/2, UZP1/2, TRN1/2 (three-same permute); CMLE/CMLT and FP FCMLE/FCMLT (compare against zero, with the literal #0 / #0.0 operand); SXTL/SXTL2/UXTL/UXTL2 (= SSHLL/USHLL #0, plain 2-register widen, shift implicit in the static bits). All reuse the VD/VN/VM register slots, so no encoder change. specgen gains an emit_cmp0 shape plus permute and widen families. All forms byte-exact vs llvm-mc; 461 tests green.