* gc.c (typedef enum): Introdule flags of major gc reason.
	* gc.c (garbage_collect_body): Ditto.
	* gc.c (gc_profile_flags): Ditto.
	* gc.c (gc_profile_dump_on): Ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41539 b2dd03c8-39d4-4d8f-98ff-823fe69b080e