[DAG] Add funnel-shift matchers to SDPatternMatch (Fixes #185880) (#186593) Add new SelectionDAG pattern matchers for funnel shifts: - m_FShL and m_FShR as ternary wrappers for ISD::FSHL/ISD::FSHR - m_FShLLike and m_FShRLike to match: -- direct FSHL/FSHR nodes -- ROTL/ROTR equivalents (binding both X and Y to the same rotate operand) -- OR(SHL(X, C), SRL(Y, BW - C)) forms (including commuted OR) Also add unit tests covering positive and negative cases for: - direct funnel-shif matching - rotate equivalence matching - OR-based funnel-shift-like patterns Fixes #185880
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