RFR: 8200716: Object propertyIsEnumerable buggy behavior on short integer-string key

[Hannes Wallnöfer]

Please review:

Bug: https://bugs.openjdk.java.net/browse/JDK-8200716
Webrev: http://cr.openjdk.java.net/~hannesw/8200716/webrev/

Thanks, 
Hannes