[Clang] Implement P0963R3 "Structured binding declaration as a condition" (#130228) This implements the R2 semantics of P0963. The R1 semantics, as outlined in the paper, were introduced in Clang 6. In addition to that, the paper proposes swapping the evaluation order of condition expressions and the initialization of binding declarations (i.e. std::tuple-like decompositions).
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