--- old/src/share/vm/opto/macro.cpp	2016-11-16 09:06:12.562498591 +0100
+++ new/src/share/vm/opto/macro.cpp	2016-11-16 09:06:12.494498589 +0100
@@ -851,6 +851,7 @@
         offset = field->offset();
         elem_type = field->type();
         basic_elem_type = field->layout_type();
+        assert(basic_elem_type != T_VALUETYPE, "value type fields are flattened");
       } else {
         offset = array_base + j * (intptr_t)element_size;
       }