RFR: [10] Backports for fixing Shenandoah JDK10 non-PCH build

[Roman Kennke]

Am 13.03.2018 um 21:24 schrieb Zhengyu Gu:
> A couple of backports to fix Shenandoah JDk10 build without precompiled
> headers.
> 
> Both patches were applied cleanly.
> 
> Webrev:
> http://cr.openjdk.java.net/~zgu/shenandoah/sh-jdk10-non-PCH/webrev.00/
> 
> Test:
> 
>   hotspot_gc_shenandoah (fastdebug + release)
> 
> Thanks,
> 
> -Zhengyu

Ok