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Egor Zhdan 7a67b350e9 [cxx-interop] Enable foreign reference types in C interop
Most of the logic for C++ foreign reference types can be applied to C types as well. Swift had a compiler flag `-Xfrontend -experimental-c-foreign-reference-types` for awhile now which enables foreign reference types without having to enable C++ interop. This change makes it the default behavior.

Since we don't expect anyone to pass `experimental-c-foreign-reference-types` currently, this also removes the frontend flag.

rdar://150308819
(cherry picked from commit 9178af3ec7)
2025-08-12 11:22:27 -07:00
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