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

8064581: Move INCLUDE_ALL_GCS include section to the end of the include list
Reviewed-by: jwilhelm, brutisso, coleenp, dholmes

6979279: remove special-case code for ParallelGCThreads==0
Reviewed-by: jwilhelm, brutisso, kbarrett

8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov

8026391: The Metachunk header wastes memory
Reviewed-by: coleenp, jmasa

8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
Summary: Rename INCLUDE_ALTERNATE_GCS to INCLUDE_ALL_GCS and replace SERIALGC with INCLUDE_ALL_GCS.
Reviewed-by: coleenp, stefank

8003935: Simplify the needed includes for using Thread::current()
Reviewed-by: dholmes, rbackman, coleenp

7045397: NPG: Add freelists to class loader arenas.
Reviewed-by: coleenp, stefank, jprovino, ohair

7197424: update copyright year to match last edit in jdk8 hotspot repository
Summary: Update copyright year to 2012 for relevant files
Reviewed-by: dholmes, coleenp

7164144: Fix variable naming style in freeBlockDictionary.* and binaryTreeDictionary*
Summary: Fix naming style to be consistent with the predominant hotspot style.
Reviewed-by: ysr, brutisso

7131629: Generalize the CMS free list code
Summary: Make the FreeChunk, FreeList, TreeList, and BinaryTreeDictionary classes usable outside CMS.
Reviewed-by: brutisso, johnc, jwilhelm
Contributed-by: coleen.phillimore@oracle.com