RFR (S): 8079091: Remove dictionary NULL check on common path of BlockFreeList methods

[Jungwoo Ha]

>
> >
> > All,
> >
> > Let's go back to Jungwoo's 00 version.  It's a clean, limited change.
> >
> > Objections?
>
> That’s mostly ok with me.
>
> I think the constructor and destructor suggestions that Stefan and I made
> should be added.
>
>
Done.
  http://cr.openjdk.java.net/~jwha/8079091/webrev.03
Can you take a look?
--Jungwoo