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Adds 9 register-only three-same mnemonics (59 forms) via specgen: ADDP/SMAXP/SMINP/UMAXP/UMINP (pairwise) and SSHL/USHL/SRSHL/URSHL (per-lane variable shift). Verified: decode round-trips (ADDP/SSHL/SMAXP/URSHL), arm64 check + 461 tests pass. Skipped the already-implemented logical/compare/mul forms (AND_V/ORR_V/EOR_V/BIC_V/ORN_V/BSL/BIT/BIF/CMEQ/CMGT/CMHI/MUL_V) to avoid duplicate keys.