add another sanity test.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63001 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/line-directive.c b/test/Preprocessor/line-directive.c
index 9b79506..e1adc61 100644
--- a/test/Preprocessor/line-directive.c
+++ b/test/Preprocessor/line-directive.c
@@ -8,3 +8,7 @@
 #line 42 "foo/bar/baz.h"  // ok
 
 
+// #line directives expand macros.
+#define A 42 "foo"
+#line A
+