RFR: Fix shenandoah jdk9 build on Windows

[Aleksey Shipilev]

On 02/26/2018 09:22 PM, Zhengyu Gu wrote:
> Fixed compilation errors on Windows.
> 
> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/sh-jdk9-build/webrev.00/

*) Not very sure this is the right thing to do:

   50     _next = *const_cast<ShenandoahStrDedupEntry* volatile*>(&next);

It seems to me that the "volatile" is not need in the original cast, so it is just:

  50     _next = static_cast<ShenandoahStrDedupEntry* volatile>(next);

?

Otherwise OK.

-Aleksey