Devirtualize AstNode and subclasses, except for visiting-related methods.

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index b0b4041c5348b3163ed806f6d69ed2b3fd0329b9..13d4712b0808ed930b78825bd39c803a96e66dc3 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -416,7 +416,8 @@ class AstGraphBuilder : public AstVisitor {
   void VisitForValues(ZoneList<Expression*>* exprs);
 
   // Common for all IterationStatement bodies.
-  void VisitIterationBody(IterationStatement* stmt, LoopBuilder* loop);
+  void VisitIterationBody(IterationStatement* stmt, LoopBuilder* loop,
+                          BailoutId stack_check_id);
 
   // Dispatched from VisitCall.
   void VisitCallSuper(Call* expr);