Fix asserts in StackFrameIterator which were effectively disabled

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index 8bfd7299fe6575e1bdc291ee1df6a536b7d74fd9..434d84b81398ec38cf58111cf5404d75b677675a 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -451,8 +451,14 @@ class ProfilerDartStackWalker : public ProfilerStackWalker {
         stack_lower_(stack_lower),
         has_exit_frame_(exited_dart_code) {
     if (exited_dart_code) {
+// On windows the profiler does not run on the thread being profiled.
+#if defined(_WIN32)
+      const bool kAllowIteratingOtherThread = true;
+#else
+      const bool kAllowIteratingOtherThread = false;
+#endif
       StackFrameIterator iterator(StackFrameIterator::kDontValidateFrames,
-                                  thread);
+                                  thread, kAllowIteratingOtherThread);
       pc_ = NULL;
       fp_ = NULL;
       sp_ = NULL;