[CIR][CIRGen] Port 1d0bd8e51be2627f79bede54735c38b917ea04ee #983
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llvm/llvm-project@1d0bd8e
moves a conditional from CodeGen to AST, and this follows suit for
consistency. (Our support for the Microsoft ABI is NYI anyway; this is
just to make things simpler to follow when matching up logic between
CodeGen and CIRGen.)