RFR: [8u] [backport] Make sure selective barriers enabling/disabling works

[Roman Kennke]

Am 28.11.2017 um 00:01 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/barrier-disable-asserts/webrev.03.jdk8u/
> 
> This is non-trivial backport to sh/jdk8u. It is non-trivial, because barrier set is smaller, *and*
> many flags are missing. The accompanying test is supposed to verify the whole thing works as expected.
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}, benchmarks against Parallel
> 
> Thanks,
> -Aleksey
> 

Looks ok to me.

Roman