Switch XFAIL format to match LLVM.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85880 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaObjC/id-isa-ref.m b/test/SemaObjC/id-isa-ref.m
index dc42f9a..fa3293c 100644
--- a/test/SemaObjC/id-isa-ref.m
+++ b/test/SemaObjC/id-isa-ref.m
@@ -1,7 +1,7 @@
 // RUN: clang-cc -fsyntax-only -verify %s
 
 // Failing currently due to Obj-C type representation changes. 2009-09-17
-// XFAIL
+// XFAIL: *
 
 typedef struct objc_object {
   struct objc_class *isa;