[CIR] Add MLIR ABI Lowering design document Design document for MLIR dialect-agnostic calling convention lowering that builds on the LLVM ABI Lowering Library (llvm/lib/ABI/) as the single source of truth for ABI classification. Dialects use the library via an adapter layer: ABITypeMapper maps dialect types to abi::Type*, the library classifies arguments and returns, and a dialect-specific ABIRewriteContext applies the decisions back to IR operations. Targets x86_64 and AArch64, with parity against Classic Clang CodeGen validated through differential testing.
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