--- a/src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp	Wed Aug 22 16:01:29 2018 +0200
+++ b/src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp	Wed Aug 22 10:36:39 2018 +0200
@@ -128,7 +128,7 @@
   ZBarrierSetC2State* s = bs->state();
   if (s->load_barrier_count() >= 2) {
     Compile::TracePhase tp("idealLoop", &C->timers[Phase::_t_idealLoop]);
-    PhaseIdealLoop ideal_loop(igvn, true, false, true);
+    PhaseIdealLoop ideal_loop(igvn, LoopOptsLastRound);
     if (C->major_progress()) C->print_method(PHASE_PHASEIDEALLOOP_ITERATIONS, 2);
   }
 }