[clang] [PAC] Implement authentication for C++ member function pointers (PR #99576)

[Daniil Kovalev via cfe-commits]

================
@@ -71,6 +71,15 @@ void has_ptrauth_vtable_pointer_type_discrimination() {}
 void no_ptrauth_vtable_pointer_type_discrimination() {}
 #endif
 
+// This is always enabled when ptrauth_calls is enabled, on new enough clangs.
----------------
kovdan01 wrote:

> Weird mismerge I guess?

Yep, I guess so

https://github.com/llvm/llvm-project/pull/99576