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55a141be4f
Adds SSHLL/SSHLL2/USHLL/USHLL2 (12 forms) via specgen, reusing NEON_SHL_IMM (left shifts need no esize; the size marker is in bits). specgen's shift shape generalized to arrangement pairs {dst, src} with the shift element size taken from the source.
Verified: encode matches llvm-mc + decode recovers mnemonic + amount (sshll/sshll2/ushll across widths); arm64 check + 461 tests pass.