Now `[x, y].max` is optimized so that a temporal array object is not
  created in some condition.

* insns.def (opt_newarray_max, opt_newarray_min): added.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54153 b2dd03c8-39d4-4d8f-98ff-823fe69b080e