--- old/src/hotspot/share/opto/loopopts.cpp	2017-09-28 12:22:53.631257952 +0200
+++ new/src/hotspot/share/opto/loopopts.cpp	2017-09-28 12:22:53.487257954 +0200
@@ -1015,6 +1015,11 @@
         Node* m = n->fast_out(j);
         if (m->is_FastLock())
           return false;
+        if (m->is_ValueType()) {
+          // TODO this breaks optimizations!
+          // Value types should not be split through phis
+          //return false;
+        }
 #ifdef _LP64
         if (m->Opcode() == Op_ConvI2L)
           return false;