Refactor duplicate logic in Ast{Traversal,Expression}Visitor

Add stack overflow checks to AstTraversalVisitor, and let
AstExpressionVisitor reuse traversal logic from AstTraversalVisitor.

R=yangguo@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2004363002
Cr-Commit-Position: refs/heads/master@{#36500}

src/ast/ast-expression-visitor.h

@@ -17,7 +17,7 @@ namespace internal {
 // A Visitor over a CompilationInfo's AST that invokes
 // VisitExpression on each expression node.
 
-class AstExpressionVisitor : public AstVisitor {
+class AstExpressionVisitor : public AstTraversalVisitor {
  public:
   AstExpressionVisitor(Isolate* isolate, Expression* root);
   AstExpressionVisitor(uintptr_t stack_limit, Expression* root);
@@ -25,20 +25,13 @@ class AstExpressionVisitor : public AstVisitor {
 
  protected:
   virtual void VisitExpression(Expression* expression) = 0;
-  int depth() { return depth_; }
-
-  void VisitDeclarations(ZoneList<Declaration*>* d) override;
-  void VisitStatements(ZoneList<Statement*>* s) override;
 
  private:
-  DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
-
 #define DECLARE_VISIT(type) void Visit##type(type* node) override;
-  AST_NODE_LIST(DECLARE_VISIT)
+  EXPRESSION_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
   Expression* root_;
-  int depth_;
 
   DISALLOW_COPY_AND_ASSIGN(AstExpressionVisitor);
 };

src/ast/ast.h

@@ -3056,20 +3056,26 @@ class AstVisitor BASE_EMBEDDED {
 class AstTraversalVisitor : public AstVisitor {
  public:
   explicit AstTraversalVisitor(Isolate* isolate);
+  explicit AstTraversalVisitor(uintptr_t stack_limit);
   virtual ~AstTraversalVisitor() {}
 
   // Iteration left-to-right.
   void VisitDeclarations(ZoneList<Declaration*>* declarations) override;
   void VisitStatements(ZoneList<Statement*>* statements) override;
-  void VisitExpressions(ZoneList<Expression*>* expressions) override;
 
 // Individual nodes
 #define DECLARE_VISIT(type) void Visit##type(type* node) override;
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
+ protected:
+  int depth() { return depth_; }
+
  private:
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
+
+  int depth_;
+
   DISALLOW_COPY_AND_ASSIGN(AstTraversalVisitor);
 };