[turbofan] Make Node::set_op safer via wrapper.

src/compiler/select-lowering.cc

Index: src/compiler/select-lowering.cc
diff --git a/src/compiler/select-lowering.cc b/src/compiler/select-lowering.cc
index 2e0f0d1a343811a82a2a2359306a5a3f63c1c5a5..ee648c6c82fafe76675ece85d879e0975e8db26a 100644
--- a/src/compiler/select-lowering.cc
+++ b/src/compiler/select-lowering.cc
@@ -8,6 +8,7 @@
 #include "src/compiler/diamond.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
+#include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
@@ -51,7 +52,7 @@ Reduction SelectLowering::Reduce(Node* node) {
   }
 
   // Create a Phi hanging off the previously determined merge.
-  node->set_op(common()->Phi(p.type(), 2));
+  NodeProperties::ChangeOp(node, common()->Phi(p.type(), 2));
   node->ReplaceInput(0, vthen);
   node->ReplaceInput(1, velse);
   node->ReplaceInput(2, merge);