Fix assertion failure encountered in vm service.

runtime/vm/deopt_instructions.cc

Index: runtime/vm/deopt_instructions.cc
===================================================================
--- runtime/vm/deopt_instructions.cc	(revision 32604)
+++ runtime/vm/deopt_instructions.cc	(working copy)
@@ -364,7 +364,10 @@
   Object& obj = Object::Handle();
   for (intptr_t i = 0; i < dest_frame_size_; i++) {
     obj = reinterpret_cast<RawObject*>(dest_frame_[i]);
-    ASSERT(obj.IsNull() || obj.IsInstance() || obj.IsContext());
+    ASSERT(obj.IsNull() ||
+           obj.IsInstance() ||
+           obj.IsContext() ||
+           obj.IsTypeArguments());
     dest_array.SetAt(i, obj);
   }
   return dest_array.raw();