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6fd233f041
New arm32 specgen (llvm-mc --triple=armv8a --mattr=+neon as the bits oracle, empirical masks): VADDL/VSUBL/VABAL/VABDL (Qd,Dn,Dm) and VADDW/VSUBW (Qd,Qn,Dm) across s/u 8/16/32; the compare aliases VCLE/VCLT (= VCGE/VCGT with Vn/Vm swapped) and VACLE/VACLT (= VACGE/VACGT swapped, f32); and VQRSHL shift-by-vector. 84 forms over 11 mnemonics. Built-in llvm round-trip verify passes; spot-checked byte-exact with distinct Q/D registers; 600 tests green.