[6.2][cxx-interop] Types exposed from ObjC modules should be behind a macro #83065
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Explanation: We the generated reverse interop headers to be valid C++, so every declaration coming from an Obj-C module should be behind an ifdef. Unfortunately, we do not always have this information but we do know that our frameworks contain Obj-C code. So this PR makes sure every entity coming from our frameworks are behind ifdef.
Issues: rdar://152836730
Original PRs: #83002
Risk: Low, the change is narrow and straightforward.
Testing: Added a compiler test.
Reviewers: @egorzhdan