Various IWYU fixes.

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 "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/compiler/types.h"
 #include "src/globals.h"
 #include "src/zone/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Forward declarations.
 class Edge;
 class Graph;
-
+class Operator;

[epertoso, 2017/01/03 11:34:49]

We're including operator.h, this seems wrong.

 
 // Marks are used during traversal of the graph to distinguish states of nodes.
 // Each node has a mark which is a monotonically increasing integer, and a
 // {NodeMarker} has a range of values that indicate states of a node.
 typedef uint32_t Mark;
 
 
 // NodeIds are identifying numbers for nodes that can be used to index auxiliary
 // out-of-line data associated with each node.
 typedef uint32_t NodeId;
@@ skipping 525 matching lines @@
 }
 
 
 Node::Uses::const_iterator Node::Uses::end() const { return const_iterator(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_H_