zoecarver 036361d1e4 [cxx-interop] Add SIL function representation cxx_method; Support extending C++ types. ...

There are three major changes here:
    1. The addition of "SILFunctionTypeRepresentation::CXXMethod".
    2. C++ methods are imported with their members *last*. Then the arguments are switched when emitting the IR for an application of the function.
    3. Clang decls are now marked as foreign witnesses.

These are all steps towards being able to have C++ protocol conformance.

2022-01-06 14:26:47 -08:00

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