hg: hsx/hotspot-gc/hotspot: 7184772: G1: Incorrect assert in HeapRegionLinkedList::add_as_head()

[john.cuthbertson at oracle.com]

Changeset: d42fe3c3001d
Author:    johnc
Date:      2012-07-17 14:57 -0700
URL:       http://hg.openjdk.java.net/hsx/hotspot-gc/hotspot/rev/d42fe3c3001d

7184772: G1: Incorrect assert in HeapRegionLinkedList::add_as_head()
Summary: Assertion incorrectly checks that _head is NULL and should be checking that _tail is NULL instead.
Reviewed-by: johnc
Contributed-by: Brandon Mitchell <brandon at twitter.com>

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