RFR (T) 8225628: Remove unused Thread::muxAcquireW function

[Harold Seigel]

Looks good, and trivial.

Harold

On 9/20/2019 10:21 AM, coleen.phillimore at oracle.com wrote:
> I didn't find any historical use of this function.  It looks like a 
> copy of muxAcquire where a different ParkEvent could be passed in or 
> allocated for the park operation.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/2019/8225628.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8225628
>
> Ran tier1 testing on all Oracle platforms.
>
> Thanks,
> Coleen
>