insns.def: adjust style

* insns.def (opt_mod, opt_aset_with, opt_aref_with, opt_regexpmatch1):
  adjust style, do not cuddle else up.

git-svn-id: svn+ssh://svn.ruby-lang.org/ruby/trunk@44703 b2dd03c8-39d4-4d8f-98ff-823fe69b080e