Run the materialized literal reindexer on default parameter initializers

R=rossberg@chromium.org
BUG=chromium:554865
LOG=n

Review URL: https://codereview.chromium.org/1442653004

Cr-Commit-Position: refs/heads/master@{#31989}

src/parser.cc

@@ -4148,6 +4148,7 @@ void ParserTraits::ReindexLiterals(const ParserFormalParameters& parameters) {
 
     for (const auto p : parameters.params) {
       if (p.pattern != nullptr) reindexer.Reindex(p.pattern);
+      if (p.initializer != nullptr) reindexer.Reindex(p.initializer);
     }
 
     if (parameters.has_rest) {

test/mjsunit/regress/regress-554865.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --harmony-default-parameters
+
+(function() {
+  var x = {};
+  ((y = [42]) => assertEquals(42, y[0]))();
+})();