Implement ES6 symbol registry and predefined symbols

test/mjsunit/harmony/private.js

Index: test/mjsunit/harmony/private.js
diff --git a/test/mjsunit/harmony/private.js b/test/mjsunit/harmony/private.js
index 9c9bf2c14fe78d366900d58a3659306605fb8bf8..a14afe04e5f90fc5691c00311c6b63793c3b1204 100644
--- a/test/mjsunit/harmony/private.js
+++ b/test/mjsunit/harmony/private.js
@@ -328,3 +328,17 @@ function TestCachedKeyAfterScavenge() {
   }
 }
 TestCachedKeyAfterScavenge();
+
+
+function TestGetOwnPropertySymbols() {
+  var privateSymbol = %CreatePrivateSymbol("private")
+  var publicSymbol = Symbol()
+  var publicSymbol2 = Symbol()
+  var obj = {}
+  obj[publicSymbol] = 1
+  obj[privateSymbol] = 2
+  obj[publicSymbol2] = 3
+  var syms = Object.getOwnPropertySymbols(obj)
+  assertEquals(syms, [publicSymbol, publicSymbol2])
+}
+TestGetOwnPropertySymbols()