Added stack overflow checks at backward branches in order to allow interrupting endless loops. Bett…

runtime/vm/dart_api_impl_test.cc

Index: runtime/vm/dart_api_impl_test.cc
===================================================================
--- runtime/vm/dart_api_impl_test.cc	(revision 4887)
+++ runtime/vm/dart_api_impl_test.cc	(working copy)
@@ -3601,23 +3601,17 @@
 
 
 void BusyLoop_start(uword unused) {
-  // TODO(turnidge): Get rid of call to 'function' after interrupts
-  // are checked on backward branches.
   const char* kScriptChars =
       "class Native {\n"
       "  static void markMainEntered() native 'MarkMainEntered';\n"
       "}\n"
-      "void function([foo='hi']) {\n"
-      "}\n"
       "\n"
       "void main() {\n"
       "  Native.markMainEntered();\n"
-      "  while (true) {\n"  // Infinite loop.
-      "    function();\n"
+      "  while (true) {\n"  // Infinite empty loop.
       "  }\n"
       "}\n";
 
-
   // Tell the other thread that shared_isolate is created.
   Dart_Handle lib;
   {