RFR: 8214144: Remove confusing locking_enqueue_completed_buffer

[Man Cao]

Looks good.
(I'm not a reviewer, though.)

-Man

On Tue, Nov 20, 2018 at 2:43 PM Kim Barrett <kim.barrett at oracle.com> wrote:
>
> Please review this trivial change to remove the confusingly named
> function PtrQueue::locking_enqueue_completed_buffer, inlining its
> simple definition at the single call site.  It used to be more
> complicated and "interesting", but was gutted by JDK-8182703.
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8214144
>
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8214144/open.00/
>
> Testing:
> Locally (linux-x64) built and ran hotspot_tier1 tests.
>