Adds a flag to the standalone vm to throw an exception on 53-bit integer overflow.

runtime/vm/intrinsifier.cc

Index: runtime/vm/intrinsifier.cc
===================================================================
--- runtime/vm/intrinsifier.cc	(revision 23187)
+++ runtime/vm/intrinsifier.cc	(working copy)
@@ -11,8 +11,8 @@
 namespace dart {
 
 DEFINE_FLAG(bool, intrinsify, true, "Instrinsify when possible");
+DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 
-
 static bool CompareNames(const Library& lib,
                          const char* test_name,
                          const char* name) {
@@ -87,6 +87,7 @@
   if (function.IsClosureFunction()) return false;
   // Can occur because of compile-all flag.
   if (function.is_external()) return false;
+  if (FLAG_throw_on_javascript_int_overflow) return false;
   return function.is_intrinsic();
 }