hg: zgc/zgc: ZGC: BACKOUT: UPSTREAM: 8196217: NMT: add_committed_regions doesn't merge succeeding regions

[per.liden at oracle.com]

Changeset: c5ccdecdd3e8
Author:    pliden
Date:      2018-02-07 13:26 +0100
URL:       http://hg.openjdk.java.net/zgc/zgc/rev/c5ccdecdd3e8

ZGC: BACKOUT: UPSTREAM: 8196217: NMT: add_committed_regions doesn't merge succeeding regions

! src/hotspot/share/services/virtualMemoryTracker.cpp
- test/hotspot/jtreg/runtime/NMT/VirtualAllocCommitMerge.java