[PATCH] JDK-8176571: Fine bitmaps should be allocated as belonging to mtGC

[Milan Mimica]

Hello

I'm resending the two patches (JDK-8176571, JDK-8182169) from my new email
address which I will be using from now on in this ML. I was notified my OCA
has been approved.

The patches have previously been discussed and generally approved. I
recreated them against the recent tip, and also removed overloaded
constructors from CHeapBitmap by using default parameters, as discussed.
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