get rid of duplicated missing feature

Author: ghehg

clang/include/clang/CIR/MissingFeatures.h

@@ -468,9 +468,6 @@ struct MissingFeatures {
   static bool mustProgress() { return false; }
 
   static bool skipTempCopy() { return false; }
-
-  // https://clang.llvm.org/docs/PointerAuthentication.html
-  static bool pointerAuthentication() { return false; }
 };
 
 } // namespace cir

clang/lib/CIR/CodeGen/CIRGenExprConst.cpp

@@ -746,7 +746,7 @@ bool ConstStructBuilder::Build(const APValue &Val, const RecordDecl *RD,
           CGM.getItaniumVTableContext()
               .getVTableLayout(VTableClass)
               .getAddressPoint(BaseSubobject(CD, Offset));
-      assert(!cir::MissingFeatures::pointerAuthentication());
+      assert(!cir::MissingFeatures::ptrAuth());
       mlir::ArrayAttr indices = builder.getArrayAttr({
           builder.getI32IntegerAttr(0),
           builder.getI32IntegerAttr(addressPoint.VTableIndex),