hg: jdk/submit12: 8217309: ZGC: Fix ZNMethodTable corruption

[per.liden at oracle.com]

Changeset: f618cfbaf35b
Author:    pliden
Date:      2019-01-24 12:23 +0100
URL:       http://hg.openjdk.java.net/jdk/submit12/rev/f618cfbaf35b

8217309: ZGC: Fix ZNMethodTable corruption
Reviewed-by: eosterlund, stefank

! src/hotspot/share/code/nmethod.cpp
! src/hotspot/share/gc/z/zNMethodTable.cpp
! src/hotspot/share/gc/z/zNMethodTable.hpp