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John Hui
867e60d12d
The importer synthesizes a `__cxx__defaultArg_*` thunk (parented to the Clang TU) for defaulted C++ parameters. Under default CMO, producer SIL cross-references it with parent module `__ObjC`. Since the thunk was never added to a SwiftLookupTable, a consumer deserializing that SIL couldn't resolve the xref and crashed. Register it at synthesis time via registerSynthesizedClangDecl, as is already done for operators like `==`. rdar://178264621