Add support for unwind

llvm-svn: 8407
diff --git a/llvm/lib/VMCore/Instruction.cpp b/llvm/lib/VMCore/Instruction.cpp
index 1a53642..122e0f7 100644
--- a/llvm/lib/VMCore/Instruction.cpp
+++ b/llvm/lib/VMCore/Instruction.cpp
@@ -56,6 +56,7 @@
   case Br:     return "br";
   case Switch: return "switch";
   case Invoke: return "invoke";
+  case Unwind: return "unwind";
     
   // Standard binary operators...
   case Add: return "add";