[JDK10] RFR: Silence compilation warnings on implicit type conversion

[Aleksey Shipilev]

On 09/05/2018 04:57 PM, Zhengyu Gu wrote:
> Finally, built Shenandoah JDK10 with VS 2013 update 3.
> 
> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/silence_win_warnings-jdk10/webrev.00/

Looks good!

-Aleksey