[JDK11] RFR: Silence compilation warnings on implicit type conversion

[Roman Kennke]

Yes. Thank you!

Am 4. September 2018 19:48:06 MESZ schrieb Zhengyu Gu <zgu at redhat.com>:
>This is Shenandoah JDK11 specific one, others should be fixed vs. 
>Shenandoah JDK backport.
>
>
>Webrev: 
>http://cr.openjdk.java.net/~zgu/shenandoah/silence_win_warnings_jdk11/webrev.00/
>
>Test:
>
>   Built on Windows.
>
>Thanks,
>
>-Zhengyu