gc.c: atomic operations for malloc_params
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36284 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
gc.c: atomic operations for malloc_params
atomic operations to update malloc_params.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36284 b2dd03c8-39d4-4d8f-98ff-823fe69b080e