RFR: 8151365: Move G1YoungGenSizer to a separate file

[Thomas Schatzl]

Hi Erik,

On Mon, 2016-03-07 at 11:09 +0100, Erik Helin wrote:
> Hi all,
> 
> this small patch just moves the class G1YoungGenSizer to a separate
> file. I will send out an additional patch that changes most of the
> methods to be const, but in this patch I just want to move the code.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8151365
> 
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8151365/webrev.00/
> 
> Testing:
> - Built locally on Linux x86-64

  ship it.

Thomas