[turbofan] Preserve Bounds when cloning nodes in the scheduler.

src/compiler/graph.h

Index: src/compiler/graph.h
diff --git a/src/compiler/graph.h b/src/compiler/graph.h
index 44258feeb2453976dc69c4387dec10678bedee8a..cb073b312acafdc01933bbb6f113be18a714f1c4 100644
--- a/src/compiler/graph.h
+++ b/src/compiler/graph.h
@@ -80,6 +80,9 @@ class Graph : public ZoneObject {
     return NewNode(op, arraysize(nodes), nodes);
   }
 
+  // Clone the {node}, and assign a new node id to the copy.
+  Node* CloneNode(const Node* node);
+
   template <class Visitor>
   inline void VisitNodeInputsFromEnd(Visitor* visitor);