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We synthesize a Swift function that only calls a C++ funtion that produces the default argument. We produce this function for each module that imports the C++ function with the default argument. This symbol needs to be public as it is created in the context of the Clang module and used from the Swift module. To avoid the linker errors, we always emit this function into the client which is also the right thing to do as the whole body is a single function call. rdar://138513915