[cxx-interop] Allow more C++ decls in public Swift interfaces #78057
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This is a follow-up to 8859b62.
Let's allow usages of C++ global variables, fields and constructors, as long as the types involved aren't fragile, e.g. if they are C-like structs.
This resolves compiler errors when trying to rebuild System.swiftmodule from its textual interface with Xcode 16.1.
rdar://140203932
rdar://141124318