8155263: DisableStartThread should not be applied to GC worker threads
Reviewed-by: tschatzl, sangheki

8151601: Cleanup locking of the Reference pending list
Reviewed-by: brutisso, stefank

8140257: Add support for "gc service threads" to ConcurrentGCThread
Summary: Push up the common run() and stop() methods from subclasses to ConcurrentGCThread, as well as declaration iof run_service() stop_service().
Reviewed-by: kbarrett, pliden

8136854: G1 ConcurrentG1RefineThread::stop delays JVM shutdown for >150ms
Summary: Decrease the default wait delay for mark thread initialization to accomodate very short running applications.
Reviewed-by: tbenson, mgerdin

8132510: Replace ThreadLocalStorage with compiler/language-based thread-local variables
Summary: Used compiled-based TLS when available. Additional contributions by Thomas Stufe (AIX) and Andrew Haley (Aarch64)
Reviewed-by: stuefe, bdelsart, dcubed

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

8138846: Remove unused enum ConcurrentGCThread::CGC_flag_type
Reviewed-by: jwilhelm, brutisso

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