8160399: is_oop_or_null involves undefined behavior
8164984: Improper use of is_oop in production code
Summary: replace oop->is_oop*() with oopDesc::is_oop*(oop) so this pointer can be verified
Reviewed-by: iklam, kvn, dholmes

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

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