hg: hsx/hotspot-gc/hotspot: 7123165: G1: output during parallel verification can get messed up

[tony.printezis at oracle.com]

Changeset: 3b2b58fb1425
Author:    tonyp
Date:      2011-12-20 12:59 -0500
URL:       http://hg.openjdk.java.net/hsx/hotspot-gc/hotspot/rev/3b2b58fb1425

7123165: G1: output during parallel verification can get messed up
Summary: Serialize the worker threads that are generating output during parallel heap verification to make sure the output is consistent.
Reviewed-by: brutisso, johnc, jmasa

! src/share/vm/gc_implementation/g1/heapRegion.cpp