Add casts to avoid a bunch of unused expr warnings. (They aren't reported right now due to a bug that I intend to fix). Ted, please review.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77630 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/array-struct.c b/test/Analysis/array-struct.c
index ba6781e..d6b6076 100644
--- a/test/Analysis/array-struct.c
+++ b/test/Analysis/array-struct.c
@@ -143,7 +143,7 @@
   int a[10];
   bar(a);
   if (a[1]) // no-warning
-    1;
+    (void)1;
 }
 
 struct s3 p[1];