Fix asserts in StackFrameIterator which were effectively disabled

runtime/vm/isolate_reload.cc

Index: runtime/vm/isolate_reload.cc
diff --git a/runtime/vm/isolate_reload.cc b/runtime/vm/isolate_reload.cc
index 4e8eac4c64e4a7b4e981f6f2f21418404515ca55..414d09381d200b545b70c0a38051459728be7825 100644
--- a/runtime/vm/isolate_reload.cc
+++ b/runtime/vm/isolate_reload.cc
@@ -772,7 +772,9 @@ void IsolateReloadContext::ReportOnJSON(JSONStream* stream) {
 
 void IsolateReloadContext::EnsuredUnoptimizedCodeForStack() {
   TIMELINE_SCOPE(EnsuredUnoptimizedCodeForStack);
-  StackFrameIterator it(StackFrameIterator::kDontValidateFrames);
+  StackFrameIterator it(StackFrameIterator::kDontValidateFrames,
+                        Thread::Current(),
+                        StackFrameIterator::kNoCrossThreadIteration);
 
   Function& func = Function::Handle();
   while (it.HasNextFrame()) {
@@ -1555,7 +1557,8 @@ void IsolateReloadContext::ResetUnoptimizedICsOnStack() {
 
   Code& code = Code::Handle(zone);
   Function& function = Function::Handle(zone);
-  DartFrameIterator iterator;
+  DartFrameIterator iterator(thread,
+                             StackFrameIterator::kNoCrossThreadIteration);
   StackFrame* frame = iterator.NextFrame();
   while (frame != NULL) {
     code = frame->LookupDartCode();