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d83065e3b8
Adds 10 Advanced-SIMD two-register-misc mnemonics (34 forms across valid arrangements) via specgen: NOT/RBIT/REV16/REV32/REV64/CLS/CLZ/CNT/URECPE/URSQRTE. llvm-mc filters illegal arrangements (CNT/NOT only 8B/16B, URECPE/URSQRTE only 2S/4S, ...). specgen.lua generalized to a SHAPE table (THREE_SAME / TWO_SAME), so adding a family is one row. Verified: decode round-trips (NOT/REV64/CNT/URECPE), arm64 check + 461 tests pass.