hg: shenandoah/jdk8u/hotspot: 3 new changesets

[roman at kennke.org]

Changeset: fa985a203d39
Author:    rkennke
Date:      2016-07-14 23:23 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/fa985a203d39

compare and swap for c2 as a loop in ad file

! src/cpu/x86/vm/x86_64.ad
! src/share/vm/opto/library_call.cpp

Changeset: a75014eb896d
Author:    rkennke
Date:      2016-07-14 23:37 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/a75014eb896d

Added null-checks in new cas-obj code for x86

! src/cpu/x86/vm/x86_64.ad

Changeset: 7cc5667f2121
Author:    rkennke
Date:      2016-07-14 23:37 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/7cc5667f2121

CAS/CAE cause segfault when expected or value loaded is null

! src/cpu/x86/vm/x86_64.ad