Fix completion of try..finally.

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 5e86d1a240d7c5bd25f7a6e70fbeb93a2c679e2a..e5acfb9631d2733bad264cb7c1264d7c00e658ea 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -462,6 +462,10 @@ class Block final : public BreakableStatement {
     statements_.Add(statement, zone);
   }
 
+  void InsertStatementAt(int index, Statement* statement, Zone* zone) {
+    statements_.InsertAt(index, statement, zone);
+  }
+
   ZoneList<Statement*>* statements() { return &statements_; }
   bool ignore_completion_value() const { return ignore_completion_value_; }
 
@@ -3205,6 +3209,8 @@ class AstNodeFactory final BASE_EMBEDDED {
         parser_zone_(ast_value_factory->zone()),
         ast_value_factory_(ast_value_factory) {}
 
+  AstValueFactory* ast_value_factory() const { return ast_value_factory_; }
+
   VariableDeclaration* NewVariableDeclaration(
       VariableProxy* proxy, VariableMode mode, Scope* scope, int pos,
       bool is_class_declaration = false, int declaration_group_start = -1) {