review request (S): 8042255 make gc src file exclusion more automatic

[John Coomes]

John Coomes (John.Coomes at oracle.com) wrote:
> Please review this small makefile change to reduce the need to update
> the list of files in make/excludeSrc.make.
> 
> http://cr.openjdk.java.net/~jcoomes/8042255-gc-exclude/

Anyone?  This was motivated the removal of the CMS AdaptiveSizePolicy
code [1].  If I can push this first, then I don't have to worry about
updating excludeSrc.make.  And neither will you, when you add or
remove cms, g1 or parnew files in the future :-).

-John

[1] http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2014-May/010036.html