8152300: Convert G1_ALLOC_REGION_TRACING to unified logging
Reviewed-by: sjohanss, stefank

8080775: Better argument formatting for assert() and friends
Reviewed-by: kbarrett, pliden

8067336: Allow that PLAB allocations at the end of regions are flexible
Summary: PLAB allocations may return a buffer that is between minimum size (current allocation) and the desired size. This allows removes a large amount of fragmentation at the end of regions.
Reviewed-by: tbenson, mgerdin

8073013: Add detailed information about PLAB memory usage
Summary: Track and provide information about direct allocation, region end waste and failure waste for G1.
Reviewed-by: jmasa, david, ehelin, mgerdin

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