8183128: Update RefineCardTableEntryClosure
Summary: Improve names and placement of RefineCardTableEntryClosure
Reviewed-by: ehelin, sjohanss

8155524: HotCardCache shouldn't be part of ConcurrentG1Refine
Summary: Make G1CollectedHeap owner of HotCardCache.
Reviewed-by: jmasa, mgerdin, tschatzl

8154154: Separate G1 specific policy code from the CollectorPolicy class hierarchy
Summary: Move G1 runtime policy code to new class G1Policy which is unrelated to CollectorPolicy
Reviewed-by: kbarrett, ehelin

8133051: Concurrent refinement threads may be activated and deactivated at random
Summary: Establish min threshold step; earlier primary refinement thread activation.
Reviewed-by: tschatzl, drwhite, mgerdin, jmasa

8152101: Move G1 concurrent refinement adjustment code out of G1CollectorPolicy
Reviewed-by: jmasa, jwilhelm, kbarrett

8139651: ConcurrentG1Refine uses ints for many of its members that should be unsigned types
Summary: ints need to be changed to size_t
Reviewed-by: kbarrett, tbenson

8138920: Refactor the sampling thread from ConcurrentG1RefineThread
Summary: Helps enable running without concurrent refinement threads
Reviewed-by: brutisso, pliden

8135025: Error message is repeated for large value at G1ConcRefinementThreads
Summary: Changed error handling when G1ConcRefinementThreads creation failed
Reviewed-by: jwilhelm, kbarrett, tschatzl

8080876: Replace unnecessary MAX2(ParallelGCThreads, 1) calls with ParallelGCThreads
Reviewed-by: kbarrett, mgerdin

8079792: GC directory structure cleanup
Reviewed-by: brutisso, stefank, david