Add undefined array subscript checker.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86837 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/misc-ps.m b/test/Analysis/misc-ps.m
index b3b4e9a..de53d41 100644
--- a/test/Analysis/misc-ps.m
+++ b/test/Analysis/misc-ps.m
@@ -745,3 +745,7 @@
   return ((union bran *)&x)->sf; // no-warning
 }
 
+void test_undefined_array_subscript() {
+  int i, a[10];
+  int *p = &a[i]; // expected-warning{{Array subscript is undefined}}
+}