hg: jdk9/dev/jdk: 8162563: Fix double checked locking in System.console()

[martinrb at google.com]

Changeset: b5c386d4f036
Author:    martin
Date:      2016-07-26 15:41 -0700
URL:       http://hg.openjdk.java.net/jdk9/dev/jdk/rev/b5c386d4f036

8162563: Fix double checked locking in System.console()
Reviewed-by: rriggs, sherman

! src/java.base/share/classes/java/lang/System.java