RFR: 8162563: Fix double checked locking in System.console()

[Xueming Shen]

+1

On 7/26/16 1:35 PM, Martin Buchholz wrote:
> Hi Xueming,
>
> I'd like you to do a wee code review,
>
> http://cr.openjdk.java.net/~martin/webrevs/openjdk9/Console-double-checked-locking/ 
> <http://cr.openjdk.java.net/%7Emartin/webrevs/openjdk9/Console-double-checked-locking/>