[wasm] Debug-time print for compiler graph

src/compiler/graph.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_GRAPH_H_
 #define V8_COMPILER_GRAPH_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
 #include "src/zone/zone-containers.h"
@@ skipping 103 matching lines @@
 
   void SetStart(Node* start) { start_ = start; }
   void SetEnd(Node* end) { end_ = end; }
 
   size_t NodeCount() const { return next_node_id_; }
 
   void Decorate(Node* node);
   void AddDecorator(GraphDecorator* decorator);
   void RemoveDecorator(GraphDecorator* decorator);
 
+  // Very simple print API usable in a debugger.
+  void Print() const;
+
  private:
   friend class NodeMarkerBase;
 
   inline NodeId NextNodeId();
 
   Zone* const zone_;
   Node* start_;
   Node* end_;
   Mark mark_max_;
   NodeId next_node_id_;
   ZoneVector<GraphDecorator*> decorators_;
 
   DISALLOW_COPY_AND_ASSIGN(Graph);
 };
 
 
 // A graph decorator can be used to add behavior to the creation of nodes
 // in a graph.
 class GraphDecorator : public ZoneObject {
  public:
   virtual ~GraphDecorator() {}
   virtual void Decorate(Node* node) = 0;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_GRAPH_H_