[clang] [clang][ptrauth] add support for options parameter to __ptrauth (PR #136828)

[Oliver Hunt via cfe-commits]

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@@ -8350,14 +8350,16 @@ static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
 /// Handle the __ptrauth qualifier.
 static void HandlePtrAuthQualifier(ASTContext &Ctx, QualType &T,
                                    const ParsedAttr &Attr, Sema &S) {
-
-  assert((Attr.getNumArgs() > 0 && Attr.getNumArgs() <= 3) &&
-         "__ptrauth qualifier takes between 1 and 3 arguments");
+  assert((Attr.getNumArgs() > 0 && Attr.getNumArgs() <= 4) &&
+         "__ptrauth qualifier takes between 1 and 4 arguments");
+  StringRef AttrName = Attr.getAttrName()->getName();
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ojhunt wrote:

`AttrName` is used because the diagnostics need the actual attribute name, and there's a future PR to add the `__ptrauth_restricted_intptr` qualifier which means it is not a constant. We can remove `AttrName` now, but it is immediately needed in the next PR.

https://github.com/llvm/llvm-project/pull/136828