[turbofan] Initial attempt to cleanup Node and related classes.

src/compiler/node-properties.h

Index: src/compiler/node-properties.h
diff --git a/src/compiler/node-properties.h b/src/compiler/node-properties.h
index 13f31d11598330e80b980036dd39d2e52628fb10..50a5ee4dab734783f62e29c0cdc6ad53d4b94411 100644
--- a/src/compiler/node-properties.h
+++ b/src/compiler/node-properties.h
@@ -39,7 +39,9 @@ class NodeProperties {
   static inline void ReplaceFrameStateInput(Node* node, Node* frame_state);
   static inline void RemoveNonValueInputs(Node* node);
   static inline void ReplaceWithValue(Node* node, Node* value,
-                                      Node* effect = NULL);
+                                      Node* effect = nullptr);
+
+  static Node* FindProjection(Node* node, size_t projection_index);
 
   static inline bool IsTyped(Node* node);
   static inline Bounds GetBounds(Node* node);