Put FunctionLiterals into temp_zone too.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index d0cf28a488d078a317c763be8f6a03038bae8289..506a3d9e294fd11a9dc0ab555670db0595fb96bd 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -4420,7 +4420,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
           function_type == FunctionLiteral::kDeclaration &&
           eager_compile_hint != FunctionLiteral::kShouldEagerCompile &&
           !(FLAG_validate_asm && scope->asm_function());
-      // Open a new BodyScope, which sets our AstNodeFactory to allocate in the
+      // Open a new zone scope, which sets our AstNodeFactory to allocate in the
       // new temporary zone if the preconditions are satisfied, and ensures that
       // the previous zone is always restored after parsing the body.
       // For the purpose of scope analysis, some ZoneObjects allocated by the
@@ -4429,8 +4429,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
       // parser-persistent zone (see parser_zone_ in AstNodeFactory).
       {
         Zone temp_zone(zone()->allocator());
-        AstNodeFactory::BodyScope inner(factory(), &temp_zone, use_temp_zone);
-
+        DiscardableZoneScope(this, &temp_zone, use_temp_zone);
         body = ParseEagerFunctionBody(function_name, pos, formals, kind,
                                       function_type, CHECK_OK);
       }