Remove dangerous default parameter from machine Store operator.

test/cctest/compiler/test-machine-operator-reducer.cc

Index: test/cctest/compiler/test-machine-operator-reducer.cc
diff --git a/test/cctest/compiler/test-machine-operator-reducer.cc b/test/cctest/compiler/test-machine-operator-reducer.cc
index 634e72e53b1d191d209079851328f1d1d56d6dc2..c79a96a0941d595ee584ec9151d89e441d332d52 100644
--- a/test/cctest/compiler/test-machine-operator-reducer.cc
+++ b/test/cctest/compiler/test-machine-operator-reducer.cc
@@ -639,8 +639,8 @@ TEST(ReduceLoadStore) {
   }
 
   {
-    Node* store =
-        R.graph.NewNode(R.machine.Store(kMachineWord32), base, index, load);
+    Node* store = R.graph.NewNode(
+        R.machine.Store(kMachineWord32, kNoWriteBarrier), base, index, load);
     MachineOperatorReducer reducer(&R.graph);
     Reduction reduction = reducer.Reduce(store);
     CHECK(!reduction.Changed());  // stores should not be reduced.