8231921: SelectorImpl.register does not need to set the attachment when it is null

[Brian Burkhalter]

> On Oct 7, 2019, at 7:08 AM, Alan Bateman <Alan.Bateman at oracle.com> wrote:
> 
> This is a small improvement to SelectableChannel.register to avoid needing to getAndSet the attachment when initially registered without an attachment.  While in the area, I've replaced the use of AtomicReferenceFieldUpdater with a VarHandle. The changes are simple:
> 
> http://cr.openjdk.java.net/~alanb/8231921/webrev/index.html <http://cr.openjdk.java.net/~alanb/8231921/webrev/index.html>
Looks all right.

Brian
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