hg: shenandoah/jdk8u/hotspot: Cherry-pick JDK-8140584: nmethod::oops_do_marking_epilogue always runs verification code

[ashipile at redhat.com]

Changeset: 87d0934dcb67
Author:    shade
Date:      2017-05-23 16:15 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/87d0934dcb67

Cherry-pick JDK-8140584: nmethod::oops_do_marking_epilogue always runs verification code

! src/cpu/ppc/vm/relocInfo_ppc.cpp
! src/cpu/sparc/vm/nativeInst_sparc.cpp
! src/cpu/sparc/vm/relocInfo_sparc.cpp
! src/cpu/x86/vm/relocInfo_x86.cpp
! src/share/vm/code/nmethod.cpp