[driver] Ignore -fno-var-tracking; it's a GCC option we don't support.

-fvar-tracking (which IIUC is on by default in GCC) will still generate
an error.

llvm-svn: 191439
diff --git a/clang/test/Driver/clang_f_opts.c b/clang/test/Driver/clang_f_opts.c
index da39638..eae78fe 100644
--- a/clang/test/Driver/clang_f_opts.c
+++ b/clang/test/Driver/clang_f_opts.c
@@ -123,4 +123,5 @@
 // RUN:     -funroll-all-loops -fno-unroll-all-loops                          \
 // RUN:     -fno-builtin-foobar                                               \
 // RUN:     -fno-builtin-strcat -fno-builtin-strcpy                           \
+// RUN:     -fno-var-tracking                                                 \
 // RUN:     %s