[clang] [AArch64][PAC] Support ptrauth builtins and -fptrauth-intrinsics. (PR #65996)

[Chuanqi Xu via cfe-commits]

================
@@ -303,6 +303,10 @@ bool Module::directlyUses(const Module *Requested) {
   if (!Requested->Parent && Requested->Name == "_Builtin_stddef_max_align_t")
     return true;
 
+  // Anyone is allowed to use our builtin ptrauth.h and its accompanying module.
+  if (!Requested->Parent && Requested->Name == "ptrauth")
----------------
ChuanqiXu9 wrote:

While I haven't understood the patch fully, I believe hardcoding the module name in such a style is not good.

https://github.com/llvm/llvm-project/pull/65996