Remove dangerous default parameter from machine Store operator.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index d0691d1277cd47f1928ac26a06d383872fe669cc..2328e2b332bb41dae0bad8c095b1ce381208edbc 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -87,8 +87,7 @@ class MachineOperatorBuilder {
     OP1(Load, MachineRepresentation, rep, Operator::kNoWrite, 2, 1);
   }
   // store [base + index], value
-  Operator* Store(MachineRepresentation rep,
-                  WriteBarrierKind kind = kNoWriteBarrier) {
+  Operator* Store(MachineRepresentation rep, WriteBarrierKind kind) {
     StoreRepresentation store_rep = {rep, kind};
     OP1(Store, StoreRepresentation, store_rep, Operator::kNoRead, 3, 0);
   }