[8u40] backport RFR (XS): 8062950: Bug in locking code when UseOptoBiasInlining is disabled: assert(dmw->is_neutral()) failed: invariant

[Vladimir Kozlov]

8u40 backport request.  Changes were pushed into jdk9 yesterday, no 
problems were found since then. Changes are applied to 8u cleanly.

https://bugs.openjdk.java.net/browse/JDK-8062950
http://cr.openjdk.java.net/~goetz/webrevs/8062950-lockBug/webrev.00/
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/ef2e397e8b7b

Thanks,
Vladimir