[cxx-interop] Implicitly defined copy constructors #84646
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If a C++ type doesn't have a user provided copy constructor, Clang will declare one implicitly, unless one of its fields is not copy-constructible. Clang assumes that any
std::vectoris always copy-constructible, including astd::vectorof a non-copy constructible type. So, let's use theCxxValueSemanticsimplemented in #84340 to figure out if we should ask Clang to define the copy constructor for such types.This also includes types that have a defaulted, user-provided copy constructor.
rdar://151870709