Add isolate event handler setup in order to be able to propagate isolate

vm/code_generator.cc

Index: vm/code_generator.cc
===================================================================
--- vm/code_generator.cc	(revision 13129)
+++ vm/code_generator.cc	(working copy)
@@ -1297,6 +1297,9 @@
     isolate->message_handler()->HandleOOBMessages();
   }
   if (interrupt_bits & Isolate::kApiInterrupt) {
+    // Signal isolate interrupt  event.
+    Debugger::SignalIsolateEvent(Debugger::kIsolateInterrupted);
+
     Dart_IsolateInterruptCallback callback = isolate->InterruptCallback();
     if (callback) {
       if ((*callback)()) {