deps: update V8 to 6.4.388.40

PR-URL: https://github.com/nodejs/node/pull/17489
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/deps/v8/test/mjsunit/regress/regress-6941.js b/deps/v8/test/mjsunit/regress/regress-6941.js
new file mode 100644
index 0000000000..a8370831f8
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-6941.js
@@ -0,0 +1,20 @@
+// Copyright 2017 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: --allow-natives-syntax --opt
+
+function foo(x) {
+  return Symbol.iterator == x;
+}
+
+function main() {
+  foo(Symbol());
+  foo({valueOf() { return Symbol.toPrimitive}});
+}
+
+%NeverOptimizeFunction(main);
+main();
+%OptimizeFunctionOnNextCall(foo);
+main();
+assertOptimized(foo);