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Odin/core
Brendan Punsky 7ebe042277 rexcode/arm64: NEON wide / narrow / XTN encode forms
Adds 24 more mixed-arrangement mnemonics (72 forms) via specgen: three-different wide (SADDW/UADDW/SSUBW/USUBW), narrowing-halving (ADDHN/SUBHN/RADDHN/RSUBHN), and two-register narrowing (XTN/SQXTN/UQXTN/SQXTUN), plus their high-half '2' variants. All register-only (VD/VN/VM or VD/VN), no encoder change.

specgen refactored to a general arrangement-tuple mechanism (uniform + long/wide/narrow/XTN share one emit path). Verified: decode round-trips (SADDW/ADDHN/XTN/SQXTUN2), arm64 check + 461 tests pass.
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