RFR: 8183542: Factor out serial GC specific code from GenCollectedHeap into its own subclass

[Kim Barrett]

> On Oct 18, 2017, at 8:08 AM, Roman Kennke <rkennke at redhat.com> wrote:
> Differential webrev:
> http://cr.openjdk.java.net/~rkennke/8183542/webrev.01.diff/ <http://cr.openjdk.java.net/%7Erkennke/8183542/webrev.01.diff/>
> 
> Full webrev:
> http://cr.openjdk.java.net/~rkennke/8183542/webrev.01/ <http://cr.openjdk.java.net/%7Erkennke/8183542/webrev.01/>
> 
> Better now?
> 
> Thanks, Roman

Looks good.