8033552: Fix missing missing volatile specifiers in CAS operations in GC code
Summary: Add missing volatile specifiers.
Reviewed-by: kbarrett, tschatzl

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

8146690: Make all classes in GC follow the naming convention.
Reviewed-by: dholmes, stefank

8129417: Oop iteration clean-up to remove oop_ms_follow_contents
Reviewed-by: pliden, ehelin

8080877: Don't use workers()->total_workers() when walking G1CollectedHeap::_task_queues
Reviewed-by: jmasa, drwhite

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