RFR: 8201213: Remove INCLUDE_ALL_GCS from memset_with_concurrent_readers

[Kim Barrett]

> On Apr 5, 2018, at 5:21 PM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to remove the INCLUDE_ALL_GCS checks from memset_with_concurrent_readers.
> 
> http://cr.openjdk.java.net/~stefank/8201213/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8201213
> 
> This only marginally reduces the libjvm.so size, and it would be easier to implement JDK-820729 without it, so I propose that we remove these checks.
> 
> Thanks,
> StefanK

Looks good.  And trivial.