hg: hsx/hotspot-gc/hotspot: 7119908: G1: Cache CSet start region for each worker for subsequent reuse

[john.cuthbertson at oracle.com]

Changeset: fd2b426c30db
Author:    johnc
Date:      2011-12-14 17:43 -0800
URL:       http://hg.openjdk.java.net/hsx/hotspot-gc/hotspot/rev/fd2b426c30db

7119908: G1: Cache CSet start region for each worker for subsequent reuse
Summary: Cache workers' calculated starting heap region, used for parallel iteration over the collcection set, for subsequent reuse.
Reviewed-by: tonyp, brutisso

! src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
! src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp