[turbofan] Move node verification methods to the Verifier class.

src/compiler/verifier.h

 // Copyright 2014 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_VERIFIER_H_
 #define V8_COMPILER_VERIFIER_H_
 
 #include "src/base/macros.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class Graph;
+class Edge;
+class Node;
 class Schedule;
 
 // Verifies properties of a graph, such as the well-formedness of inputs to
 // each node, etc.
 class Verifier {
  public:
   enum Typing { TYPED, UNTYPED };
 
   static void Run(Graph* graph, Typing typing = TYPED);
 
+#ifdef DEBUG
+  // Verifies consistency of node inputs and uses:
+  // - node inputs should agree with the input count computed from
+  //   the node's operator.
+  // - effect inputs should have effect outputs.
+  // - control inputs should have control outputs.
+  // - frame state inputs should be frame states.
+  // - if the node has control uses, it should produce control.
+  // - if the node has effect uses, it should produce effect.
+  // - if the node has frame state uses, it must be a frame state.
+  static void VerifyNode(Node* node);
+
+  // Verify that {replacement} has the required outputs
+  // (effect, control or frame state) to be used as an input for {edge}.
+  static void VerifyEdgeInputReplacement(const Edge& edge,
+                                         const Node* replacement);
+#else
+  static void VerifyNode(Node* node) {}
+  static void VerifyEdgeInputReplacement(const Edge& edge,
+                                         const Node* replacement) {}
+#endif  // DEBUG
+
  private:
   class Visitor;
   DISALLOW_COPY_AND_ASSIGN(Verifier);
 };
 
 // Verifies properties of a schedule, such as dominance, phi placement, etc.
 class ScheduleVerifier {
  public:
   static void Run(Schedule* schedule);
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_VERIFIER_H_