In FiftyThreeBitOverflow, stores overflowing value as a string.

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 24288)
+++ runtime/vm/object.cc	(working copy)
@@ -10635,7 +10635,8 @@
 // Throw FiftyThreeBitOverflow exception.
 static void ThrowFiftyThreeBitOverflow(const Integer& i) {
   const Array& exc_args = Array::Handle(Array::New(1));
-  exc_args.SetAt(0, i);
+  const String& i_str = String::Handle(String::New(i.ToCString()));
+  exc_args.SetAt(0, i_str);
   Exceptions::ThrowByType(Exceptions::kFiftyThreeBitOverflowError, exc_args);
 }