hg: zgc/zgc: ZGC: Add initialization check for ZWorkers

[stefan.karlsson at oracle.com]

Changeset: 82ac7226e311
Author:    stefank
Date:      2018-06-05 13:53 +0200
URL:       http://hg.openjdk.java.net/zgc/zgc/rev/82ac7226e311

ZGC: Add initialization check for ZWorkers

! src/hotspot/share/gc/z/zWorkers.cpp