Update test case to use not tool.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152664 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/diagnostics.c b/test/Driver/diagnostics.c
index 1330041..9abcdb6 100644
--- a/test/Driver/diagnostics.c
+++ b/test/Driver/diagnostics.c
@@ -1,9 +1,9 @@
 // Parse diagnostic arguments in the driver
 // PR12181
 
-// RUN: !%clang -target x86_64-apple-darwin10 \
+// RUN: not %clang -target x86_64-apple-darwin10 \
 // RUN:   -fsyntax-only -fzyzzybalubah \ 
 // RUN:   -Werror=unused-command-line-argument %s 
 
-// RUN: !%clang -target x86_64-apple-darwin10 \
+// RUN: not %clang -target x86_64-apple-darwin10 \
 // RUN:   -fsyntax-only -fzyzzybalubah -Werror %s