Fix asserts in StackFrameIterator which were effectively disabled

runtime/lib/object.cc

Index: runtime/lib/object.cc
diff --git a/runtime/lib/object.cc b/runtime/lib/object.cc
index 603f40c0acf24a19cd09e5908179e2a810453b10..acfa206e2fc1beea80cf461fd81ecd020636fb58 100644
--- a/runtime/lib/object.cc
+++ b/runtime/lib/object.cc
@@ -199,7 +199,7 @@ DEFINE_NATIVE_ENTRY(Object_instanceOf, 4) {
   }
   if (!is_instance_of && !bound_error.IsNull()) {
     // Throw a dynamic type error only if the instanceof test fails.
-    DartFrameIterator iterator;
+    DartFrameIterator iterator(thread, false);
     StackFrame* caller_frame = iterator.NextFrame();
     ASSERT(caller_frame != NULL);
     const TokenPosition location = caller_frame->GetTokenPos();
@@ -230,7 +230,7 @@ DEFINE_NATIVE_ENTRY(Object_simpleInstanceOf, 2) {
                             Object::null_type_arguments(), &bound_error);
   if (!is_instance_of && !bound_error.IsNull()) {
     // Throw a dynamic type error only if the instanceof test fails.
-    DartFrameIterator iterator;
+    DartFrameIterator iterator(thread, false);
     StackFrame* caller_frame = iterator.NextFrame();
     ASSERT(caller_frame != NULL);
     const TokenPosition location = caller_frame->GetTokenPos();
@@ -276,7 +276,7 @@ DEFINE_NATIVE_ENTRY(Object_as, 4) {
     }
   }
   if (!is_instance_of) {
-    DartFrameIterator iterator;
+    DartFrameIterator iterator(thread, false);
     StackFrame* caller_frame = iterator.NextFrame();
     ASSERT(caller_frame != NULL);
     const TokenPosition location = caller_frame->GetTokenPos();