[libc++] Remove obsolete _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF (#112745)
I don't know if that macro was ever truly defined by Clang, however it's
not anymore, so that is effectively dead code.
diff --git a/libcxx/include/__memory/addressof.h b/libcxx/include/__memory/addressof.h
index ecb68e0..98b08958a 100644
--- a/libcxx/include/__memory/addressof.h
+++ b/libcxx/include/__memory/addressof.h
@@ -23,11 +23,9 @@
return __builtin_addressof(__x);
}
-#if _LIBCPP_HAS_OBJC_ARC && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF)
+#if _LIBCPP_HAS_OBJC_ARC
// Objective-C++ Automatic Reference Counting uses qualified pointers
-// that require special addressof() signatures. When
-// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler
-// itself is providing these definitions. Otherwise, we provide them.
+// that require special addressof() signatures.
template <class _Tp>
inline _LIBCPP_HIDE_FROM_ABI __strong _Tp* addressof(__strong _Tp& __x) _NOEXCEPT {
return &__x;
