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824421853f
Adds 11 mnemonics (59 forms) via specgen: across-lanes reductions ADDV/SMAXV/SMINV/UMAXV/UMINV (scalar B/H/S dst) and SADDLV/UADDLV (widened scalar dst), plus pairwise-long SADDLP/UADDLP/SADALP/UADALP. The scalar destination packs into the same VD field, so still no encoder change. specgen.emit generalized to accept scalar-register operand tokens (B/H/S/D) alongside vector arrangements. Verified: decode round-trips (ADDV/SADDLV/UMINV/SADDLP), arm64 check + 461 tests pass.