diff --git a/include/llvm/Support/CFG.h b/include/llvm/Support/CFG.h
index 9355139f34a..0a58104ee4f 100644
--- a/include/llvm/Support/CFG.h
+++ b/include/llvm/Support/CFG.h
@@ -111,6 +111,10 @@ public:
     idx = I.idx;
     return *this;
   }
+
+  /// getSuccessorIndex - This is used to interface between code that wants to
+  /// operate on terminator instructions directly.
+  unsigned getSuccessorIndex() const { return Idx; }
     
   inline bool operator==(const _Self& x) const { return idx == x.idx; }
   inline bool operator!=(const _Self& x) const { return !operator==(x); }