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f78a3a5573
Adds 26 widening long mnemonics (72 forms) via specgen: SADDL/UADDL/SSUBL/USUBL, SMULL/UMULL, SMLAL/UMLAL/SMLSL/UMLSL, SQDMULL/SQDMLAL/SQDMLSL and their high-half '2' variants. Destination arrangement is wider than the sources (Vd.8H, Vn.8B, Vm.8B; the '2' forms read the high half). Encoding stays VD/VN/VM, so no encoder change. specgen gains a mixed-arrangement THREE_DIFF shape (low/high source-half pairs). Verified: decode round-trips (SMULL/SADDL2/SQDMULL/UMLAL), arm64 check + 461 tests pass.