warn about long long when in c89 mode.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41543 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/c89.c b/test/Sema/c89.c
index 57085db..a784722 100644
--- a/test/Sema/c89.c
+++ b/test/Sema/c89.c
@@ -17,3 +17,6 @@
     __extension__ int j; /* expected-warning {{mixing declarations and code}} */
   }
 }
+
+long long x;   /* expected-warning {{extension}} */
+