RFR: 8221748: Remove unused oopDesc::is_unlocked_oop()

[Kim Barrett]

> On Apr 1, 2019, at 9:04 AM, Per Liden <per.liden at oracle.com> wrote:
> 
> Remove unused oopDesc::is_unlocked_oop().
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8221748
> Webrev: http://cr.openjdk.java.net/~pliden/8221748/webrev.0
> 
> /Per

Looks good.  Also looks trivial to me.