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 23635)
+++ 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) {
@@ -98,6 +98,7 @@
   Function& func = Function::Handle(isolate);
   String& str = String::Handle(isolate);
   Error& error = Error::Handle(isolate);
+  bool set_intrinsic = true;
 
 #define SETUP_FUNCTION(class_name, function_name, destination, fp)             \
   if (strcmp(#class_name, "::") == 0) {                                        \
@@ -117,12 +118,18 @@
     func = cls.LookupFunctionAllowPrivate(str);                                \
   }                                                                            \
   ASSERT(!func.IsNull());                                                      \
-  func.set_is_intrinsic(true);                                                 \
+  func.set_is_intrinsic(set_intrinsic);                                        \
 
   // Set up all core lib functions that can be intrisified.
   lib = Library::CoreLibrary();
   CORE_LIB_INTRINSIC_LIST(SETUP_FUNCTION);
 
+  // Integer intrinsics are in the core library, but we don't want to intrinsify
+  // if we are looking for javascript integer overflow.
+  set_intrinsic = !FLAG_throw_on_javascript_int_overflow;
+  CORE_INTEGER_LIB_INTRINSIC_LIST(SETUP_FUNCTION);
+  set_intrinsic = true;
+
   // Set up all math lib functions that can be intrisified.
   lib = Library::MathLibrary();
   MATH_LIB_INTRINSIC_LIST(SETUP_FUNCTION);
@@ -153,6 +160,7 @@
 
   if (lib.raw() == Library::CoreLibrary()) {
     CORE_LIB_INTRINSIC_LIST(FIND_INTRINSICS);
+    CORE_INTEGER_LIB_INTRINSIC_LIST(FIND_INTRINSICS);
   } else if (lib.raw() == Library::TypedDataLibrary()) {
     TYPED_DATA_LIB_INTRINSIC_LIST(FIND_INTRINSICS);
   } else if (lib.raw() == Library::MathLibrary()) {