switch to using -verify


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57068 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/undef-error.c b/test/Preprocessor/undef-error.c
index af9f516..a276934 100644
--- a/test/Preprocessor/undef-error.c
+++ b/test/Preprocessor/undef-error.c
@@ -1,5 +1,5 @@
-// RUN: not clang %s -pedantic-errors -E
+// RUN: clang %s -pedantic-errors -verify 
 // PR2045
 
 #define b
-#undef a b
+/* expected-error {{extra tokens at end of #undef directive}} */ #undef a b