[es7] implement |do| expressions proposal

src/ast-numbering.cc

Index: src/ast-numbering.cc
diff --git a/src/ast-numbering.cc b/src/ast-numbering.cc
index 145025afa9394b02f06ee08e6bdc9bda4f4fd242..fb0df634e7a208469b9bb97b718a2c12998630d9 100644
--- a/src/ast-numbering.cc
+++ b/src/ast-numbering.cc
@@ -136,6 +136,15 @@ void AstNumberingVisitor::VisitNativeFunctionLiteral(
 }
 
 
+void AstNumberingVisitor::VisitDoExpression(DoExpression* node) {
+  IncrementNodeCount();
+  DisableCrankshaft(kDoExpression);
+  node->set_base_id(ReserveIdRange(DoExpression::num_ids()));
+  Visit(node->block());
+  Visit(node->result());
+}
+
+
 void AstNumberingVisitor::VisitLiteral(Literal* node) {
   IncrementNodeCount();
   node->set_base_id(ReserveIdRange(Literal::num_ids()));