RFR: 8242901: Duplicate PSYoung/OldGen max size functions

[Kim Barrett]

> On May 11, 2020, at 5:15 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Looks good.
> 
> I think I would have preferred to get rid of the _gen infix, since it's redundant.
> 
> _init_gen_size => _init_size
> _min_gen_size => _min_size
> _max_gen_size => _max_size
> 
> min_gen_size() => min_size()
> max_size() => max_size()
> 
> I'll leave it up to you to decide if you want to do that change.

I thought about doing that earlier, and revisited the question because
of your comment. There are a number of min/max_mumble_size and mumble_size
names, so that I think an unadorned min/max_size ends up being somewhat
unhelpful.

While I was looking at that I noticed a few places that were being
inconsistent with nearby code by directly accessing _min/max_gen_size
rather than using the accessor functions.  I tidied those up.

It seems _init_gen_size is only used during initialization and never
accessed again (for either generation), so could just be passed from
the constructor argument into the initialization functions as an
argument rather than via a member variable.  I tidied that up too.

New webrevs:
full: https://cr.openjdk.java.net/~kbarrett/8242901/open.01/
incr: https://cr.openjdk.java.net/~kbarrett/8242901/open.01.inc/

Testing:
Local (linux-x64) hotspot:tier1 with -XX:+UseParallelGC.