Add a goto instruction to the IL use it to terminate basic blocks.

vm/intermediate_language.cc

Index: vm/intermediate_language.cc
===================================================================
--- vm/intermediate_language.cc	(revision 9252)
+++ vm/intermediate_language.cc	(working copy)
@@ -171,6 +171,22 @@
 }
 
 
+intptr_t GotoInstr::InputCount() const {
+  return 0;
+}
+
+
+Value* GotoInstr::InputAt(intptr_t i) const {
+  UNREACHABLE();
+  return NULL;
+}
+
+
+void GotoInstr::SetInputAt(intptr_t i, Value* value) {
+  UNREACHABLE();
+}
+
+
 intptr_t ParallelMoveInstr::InputCount() const {
   UNREACHABLE();
   return 0;