hg: shenandoah/jdk9/hotspot: 2 new changesets

[ashipile at redhat.com]

Changeset: 8f51b51a635f
Author:    shade
Date:      2017-11-20 20:52 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/8f51b51a635f

[backport] Passive should opt-in the barriers, not opt-out

! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.cpp

Changeset: d2306c40a995
Author:    shade
Date:      2017-11-20 21:13 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/d2306c40a995

[backport] Enable biased locking for Shenandoah by default

! src/share/vm/runtime/arguments.cpp