8173764: G1 BOT wrongly assumes that objects must always begin at the start of G1BlockOffsetTablePart
Reviewed-by: tschatzl, kbarrett

8166607: G1 needs klass_or_null_acquire
Summary: Use acquire where needed, split refinment humongous and non to simplify.
Reviewed-by: tschatzl, ehelin

8146694: Break out shared constants and static BOT functions.
Reviewed-by: jwilhelm, tbenson

8146399: Refactor the BlockOffsetTable classes.
Reviewed-by: mgerdin, jwilhelm, tschatzl

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

8138681: Runtime.getFreeMemory() reports wrong value after humongous allocation.
Reviewed-by: tschatzl, mgerdin

8139867: Change how startsHumongous and continuesHumongous regions work in G1.
Reviewed-by: tschatzl, tbenson

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

8081202: Hotspot compile warning: "Invalid suffix on literal; C++11 requires a space between literal and identifier"
Summary: Need to add a space between macro identifier and string literal
Reviewed-by: stefank, dholmes, kbarrett

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