hg: graal/graal-jvmci-8: Fix assertion failures with G1 barrier logic and guard InstalledCode updates

[doug.simon at oracle.com]

Changeset: 2dea101cdfe9
Author:    Tom Rodriguez <tom.rodriguez at oracle.com>
Date:      2015-11-13 09:31 -0800
URL:       http://hg.openjdk.java.net/graal/graal-jvmci-8/rev/2dea101cdfe9

Fix assertion failures with G1 barrier logic and guard InstalledCode updates

! src/share/vm/code/nmethod.cpp
! src/share/vm/code/nmethod.hpp
! src/share/vm/jvmci/jvmciCompilerToVM.cpp
! src/share/vm/jvmci/jvmciCompilerToVM.hpp