DiscardableZoneScope fix. It was an unintentional noop.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 6b4848dc4074cd46a9ffe00c635b2eb1fcffd2d6..a45471f7444ddc4981eaefa2dcd92c87b48c16c2 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -4443,7 +4443,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
       // parser-persistent zone (see parser_zone_ in AstNodeFactory).
       {
         Zone temp_zone(zone()->allocator());
-        DiscardableZoneScope(this, &temp_zone, use_temp_zone);
+        DiscardableZoneScope zone_scope(this, &temp_zone, use_temp_zone);
         body = ParseEagerFunctionBody(function_name, pos, formals, kind,
                                       function_type, CHECK_OK);
       }