Use ',' separation in XFAILs, lit doesn't evaluate them as regexs (easy to add,
but might as well use the more standard syntax).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86553 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/FrontendC++/2006-11-06-StackTrace.cpp b/test/FrontendC++/2006-11-06-StackTrace.cpp
index bbb9af1..24eeda8 100644
--- a/test/FrontendC++/2006-11-06-StackTrace.cpp
+++ b/test/FrontendC++/2006-11-06-StackTrace.cpp
@@ -12,7 +12,7 @@
 
 // Only works on ppc (but not apple-darwin9), x86 and x86_64.  Should
 // generalize?
-// XFAIL: alpha|arm|powerpc-apple-darwin9
+// XFAIL: alpha,arm,powerpc-apple-darwin9
 
 #include <stdlib.h>