--- old/src/hotspot/share/opto/macro.cpp	2019-01-08 17:03:17.994523732 +0100
+++ new/src/hotspot/share/opto/macro.cpp	2019-01-08 17:03:17.674526277 +0100
@@ -966,7 +966,7 @@
   // Scalarize value types that were added to the safepoint
   for (uint i = 0; i < value_worklist.size(); ++i) {
     Node* vt = value_worklist.at(i);
-    vt->as_ValueType()->make_scalar_in_safepoints(C->root(), &_igvn);
+    vt->as_ValueType()->make_scalar_in_safepoints(&_igvn);
   }
   return true;
 }