RFR: Conditionally build Shenandoah on supported platforms only

[Roman Kennke]

Am 15.06.2018 um 15:52 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/conditional-compilation/webrev.02/
> 
> Since we have conditional GC compilation in sh/jdk, we can ditch platform-specific stubs on
> unsupported platforms, and still remain buildable.
> 
> Testing: {x86_64, aarch64, ppc64el, s390x, armhf}, {server, zero} builds
> 
> Thanks,
> -Aleksey
> 

Yes
Thanks, Roman