Fixed regexp zone issue

test/cctest/test-ast.cc

Index: test/cctest/test-ast.cc
diff --git a/test/cctest/test-ast.cc b/test/cctest/test-ast.cc
index 7d10c82224b922c03032f1f88d8402400394ecb9..86462897029d15497bd519aa9bc24aeef798fb19 100644
--- a/test/cctest/test-ast.cc
+++ b/test/cctest/test-ast.cc
@@ -38,6 +38,7 @@ TEST(List) {
   List<Node*>* list = new List<Node*>(0);
   CHECK_EQ(0, list->length());
 
+  ZoneScope zone_scope(DELETE_ON_EXIT);
   Node* node = new EmptyStatement();
   list->Add(node);
   CHECK_EQ(1, list->length());