8151045: Remove code duplication in PLABStats/G1EvacStats::adjust_desired_plab_sz
Summary: Move class specific code to the helper method
Reviewed-by: kbarrett, tschatzl

8141141: Young and Old gen PLAB stats are similar in output with -XX:+PrintPLAB
Summary: Improve PLAB statistic by adding generation, output values are now in bytes, including units, and split it into multiple messages.
Reviewed-by: brutisso, sjohanss

8145092: Use Unified Logging for the GC logging
Summary: JEP-271. VM changes contributed by brutisso, test changes contributed by david.
Reviewed-by: sjohanss, david, brutisso
Contributed-by: bengt.rutisson@oracle.com, david.lindholm@oralce.com

8067339: PLAB reallocation might result in failure to allocate object in that recently allocated PLAB
Summary: Properly size the PLAB to make sure that the object to allocate always has enough space in it.
Reviewed-by: mgerdin, brutisso

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

8133470: Uses of Atomic methods in plab.hpp should be moved to .inline.hpp file
Summary: Fix include file dependencies according to general guidelines for plab.hpp
Reviewed-by: ehelin, mgerdin

8079555: REDO - Determining the desired PLAB size adjusts to the the number of threads at the wrong place
Summary: Calculate the desired PLAB value for a single thread and then return desired PLAB size according to the current number of threads when needed
Reviewed-by: jmasa, tschatzl

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