BUG=
Review URL: https://codereview.chromium.org/
1214673007
Cr-Commit-Position: refs/heads/master@{#29538}
CHECK(map->IsMap());
CHECK(heap()->map_space()->Contains(map));
+ // Double unboxing in LO space is not allowed. This would break the
+ // lookup mechanism for store and slot buffer entries which use the
+ // page header tag.
+ CHECK(object->ContentType() != HeapObjectContents::kMixedValues);
+
// We have only code, sequential strings, external strings
// (sequential strings that have been morphed into external
// strings), fixed arrays, byte arrays, and constant pool arrays in the