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Egor Zhdan 4632d894e6 [cxx-interop] Avoid circular reference errors when importing C++ structs

When importing a C++ struct, if its owning module requires cplusplus, Swift tried to auto-conform it to certain protocols from the Cxx module. This triggers name lookup in the clang struct, specifically for `__beginUnsafe()` and `__endUnsafe` methods, which imports all of the base structs including their methods.

This moves the import of base structs out of the name lookup request, preventing cycles.

rdar://116426238

2023-10-23 12:19:05 +01:00

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 // RUN: %target-swift-emit-ir -I %S/Inputs -enable-experimental-cxx-interop %s -validate-tbd-against-ir=none
 // We should not fail with a circular reference error here.
 import ReferenceToDerived
 func foo(_ x: D) {}