8173335: Improve logging for j.l.ref.reference processing
Summary: Add logs for each phases of references and stats for each worker threads
Reviewed-by: tschatzl, shade

8182696: Remove gcTrace.hpp include from referenceProcessor.hpp
Reviewed-by: tschatzl, kbarrett

8156500: Move Reference pending list into VM to prevent deadlocks
Summary: Move reference pending list and locking into VM
Reviewed-by: coleenp, dholmes, dcubed, mchung, plevart
Contributed-by: kim.barrett@oracle.com, per.liden@oracle.com

8153745: Avoid spawning G1ParPreserveCMReferentsTask when there is no work to be done
Reviewed-by: brutisso, jmasa, tschatzl

8149343: assert(rp->num_q() == no_of_gc_workers) failed: sanity
Reviewed-by: tschatzl, kbarrett

8146395: Add inline qualifier in oop.hpp and fix inlining in gc files
Summary: Fix remaining issues after 8146401. Also fix windows VS2010 linkage problem (g1OopClosures.hpp).
Reviewed-by: stefank, mgerdin

8143847: Remove REF_CLEANER reference category
Summary: Remove REF_CLEANER.
Reviewed-by: jwilhelm, mchung, tbenson

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

8134953: Make the GC ID available in a central place
Reviewed-by: pliden, jmasa

8136991: [REDO] Additional number of processed references printed with -XX:+PrintReferenceGC after JDK-8047125
Reviewed-by: kbarrett, tschatzl

8136627: Backout JDK-8133818 Additional number of processed references printed with -XX:+PrintReferenceGC after JDK-8047125
Reviewed-by: brutisso

8133818: Additional number of processed references printed with -XX:+PrintReferenceGC after JDK-8047125
Summary: Test contributed by brutisso
Reviewed-by: tonyp, tschatzl

8058265: No callers of ReferenceProcessor::clear_discovered_references
Summary: Removed unused or unneeded code.
Reviewed-by: brutisso, jmasa

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