RFR 8229420: [Redo] jstat reports incorrect values for OU for CMS GC

[Poonam Parhar]

Hello,

The fix for JDK-8215523 
<https://bugs.openjdk.java.net/browse/JDK-8215523> had to be backed out 
with '8227178: Backout of 8215523' because it had caused timeout 
failures for some of the CMS tests.

Changeset of JDK-8215523: 
http://hg.openjdk.java.net/jdk/jdk/rev/734e58d8477b

Those failures get resolved by adding the following check before calling 
recalculate_used_stable() in CompactibleFreeListSpace::allocate():

1387   // During GC we do not need to recalculate the stable used value for
1388   // every allocation in old gen. It is done once at the end of GC instead
1389   // for performance reasons.
1390   if (!CMSHeap::heap()->is_gc_active()) {
1391     recalculate_used_stable();
1392   }
1393


Please review the webrev with the updated fix:
http://cr.openjdk.java.net/~poonam/8229420/webrev.00/

Thanks,
Poonam

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