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7cd39f1d0d
Adds 16 mnemonics (72 forms) via specgen: FP two-register FABS/FNEG/FSQRT, FRINTA/I/M/N/P/X/Z, FRECPE/FRSQRTE; and FP across-lanes FMAXV/FMINV/FMAXNMV/FMINNMV (scalar S/H dst). SP/DP are .NEON, half-precision .FP16. specgen per-form feature now scans all operands for an FP16 arrangement (handles scalar-dst across-lanes, where FP16 lives on the source). Verified: decode round-trips incl. FP16 (fabs/fsqrt.8h/frecpe/fmaxv), arm64 check + 461 tests pass.