RFR: [10] Bulk backports to sh/jdk10

[Roman Kennke]

Looks good!
Thanks!

Roman


> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk10-20180514/webrev.01/
> 
> This backports recent work to sh/jdk10:
> 
>  [backport] Several small aarch64 fixes
>  [backport] Critical native tests should only be ran on x86_64 platforms
>  [backport] Remove debug messages in BitMap::copy_from()
>  [backport] Fix Minimal VM build
>  [backport] Fixing Windows and ARM32 build
>  [backport] Fix ShFreeSet boundary case
>  [backport] Cleanup: removed unused code
>  [backport] Rename ShenandoahConcurrentThread to ShenandoahControlThread
>  [backport] Break heuristics out from ShCollectorPolicy into their own source files
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>