[turbofan] Fix the node matchers.

src/compiler/node.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_NODE_H_
 #define V8_COMPILER_NODE_H_
 
 #include <deque>
 #include <set>
 #include <vector>
@@ skipping 64 matching lines @@
 
 typedef ZoneVector<NodeVector> NodeVectorVector;
 typedef NodeVectorVector::iterator NodeVectorVectorIter;
 typedef NodeVectorVector::reverse_iterator NodeVectorVectorRIter;
 
 typedef Node::Uses::iterator UseIter;
 typedef Node::Inputs::iterator InputIter;
 
 // Helper to extract parameters from Operator1<*> nodes.
 template <typename T>
-static inline T OpParameter(const Node* node) {
+static inline const T& OpParameter(const Node* node) {
   return OpParameter<T>(node->op());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_H_