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

src/compiler/node-properties.cc

Index: src/compiler/node-properties.cc
diff --git a/src/compiler/node-properties.cc b/src/compiler/node-properties.cc
index 19ca5dd1b655c8bf727799fb4c7d75b46161f61f..80031eb2dcb32a163e3fb501e7e2fa7c2b64fb45 100644
--- a/src/compiler/node-properties.cc
+++ b/src/compiler/node-properties.cc
@@ -196,6 +196,13 @@ void NodeProperties::ReplaceUses(Node* node, Node* value, Node* effect,
 
 
 // static
+void NodeProperties::ChangeOp(Node* node, const Operator* new_op) {
+  DCHECK_EQ(OperatorProperties::GetTotalInputCount(new_op), node->InputCount());
+  node->set_op(new_op);
+}
+
+
+// static
 Node* NodeProperties::FindProjection(Node* node, size_t projection_index) {
   for (auto use : node->uses()) {
     if (use->opcode() == IrOpcode::kProjection &&