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239dea4f55
New MVE_ROT_HCADD (#90/#270 at bit12) and MVE_ROT_CMLA (#0/90/180/270 at bits 24:23) rotation encodings -- the rotation degrees round-trip properly (unlike the existing FCMA VCMLA which leaves it unencoded). One form each with the element-size bits left variable (MVE convention). Verify round-trips; all rotations byte-exact vs llvm-mc; 600 tests green. (VMLSV/VMLSVA reduce ops deferred: their format decode-collides with other MVE encodings given the 4-bit VN_Q vs MVE's 3-bit Qn.)