gc.c (RGENGC_OBJ_INFO, obj_info): add a macro to enable/disable
rich obj_info() output.
At the default, the value of RGENGC_OBJ_INFO is
(RGENGC_DEBUG | RGENGC_CHECK_MODE).
gc.c (RGENGC_OBJ_INFO): force enable it to debug #11244.
gc.c (gc_mark_ptr): print more details with obj_info().
rich obj_info() output.
At the default, the value of RGENGC_OBJ_INFO is
(RGENGC_DEBUG | RGENGC_CHECK_MODE).
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51018 b2dd03c8-39d4-4d8f-98ff-823fe69b080e