add NEWS about rb_gc_set_params() and rb_gc_count()
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
add NEWS about rb_gc_set_params() and rb_gc_count()
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e