PerfData counter: sun.gc.policy.generations in JDK 8

[Srinivas Ramakrishna]

With perm gen going away (and being replaced by metaspace) in JDK 8, it
makes sense that the counter
sun.gc.policy.generations should be "2", rather than "3". However, in JDK 8
that counter still says 3.
As I understand, the intention was that this counter would allow you to
(for example) know the range of
the sun.gc.generation.$num.* counters describing each of $num <
sun.gc.policy.generations in the heap.
Recall that the erstwhile perm gen in JDK 7 used to be synonymous with
sun.gc.generation.2, but the
JDK 8 avatars are now sun.gc.metaspace and sun.gc.compressedclassspace.

The fix is simple, and I can submit a patch. Is there an existing bug for
this?

thanks!
-- ramki
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