RFR: 8202722: Move marksweep_init into GC code

[Kim Barrett]

> On May 7, 2018, at 10:21 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to move marksweep_init into GC code.
> 
> http://cr.openjdk.java.net/~stefank/8202722/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8202722
> 
> marksweep_init is guarded by INCLUDE_SERIALGC in init.cpp. I propose that we move this code to MarkSweep and only call it when actually setting up GCs using MarkSweep.
> 
> Thanks,
> StefanK

Looks good.