There is a sporadic failure interactive_ui_tests --gtest_filter=DevToolsSanityTest.TestExpandScope where the ASSERT inv8/src/objects-debug.cc, line 652
# CHECK(code_cache() == Heap::empty_fixed_array()) failed
This is because the map of a slow case object can contain entries in its code cache, due to store ICs with an API defined callback on a field. In this case, the object contains store ICs for textContent and InnerHTML (so it is a DOM object). So the issue of these store ICs must be reconciled with the normalized map cache. These should be cleared if there the fast-case object being converted does not have the same callbacks. Also, should these be cleared if the callback is changed with delete or GetterSetter?
Removing the change from V8 until this is resolved.