RFR (XS): 8014405: G1: PerRegionTable::fl_mem_size() calculates size of the free list using wrong element sizes

[Thomas Schatzl]

Hi,

  there is another webrev at
http://cr.openjdk.java.net/~tschatzl/8014405/webrev.2/ that incorporates
the latest comments of Bengt.

Testing:
jprt

Changes to rev1:
- removed the if (!UseG1GC) check
- added cleanup of the free list pointer and the dummy PRT in the test
case as suggested by Bengt

Changes of rev1 to rev0:
- added some check to not run the test when not running with G1
- move of code, and renamings

Hth,
Thomas