hg: jdk/sandbox: 8211233: MemBarNode::trailing_membar() and MemBarNode::leading_membar() need to handle dying subgraphs better

[chris.hegarty at oracle.com]

Changeset: bbc90467f354
Author:    roland
Date:      2018-09-27 17:46 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/bbc90467f354

8211233: MemBarNode::trailing_membar() and MemBarNode::leading_membar() need to handle dying subgraphs better
Reviewed-by: kvn, thartmann

! src/hotspot/share/opto/memnode.cpp