eval.c: indent

* eval.c (using_module_recursive): adjust indent.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44168 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
eval.c: clear cache

* eval.c (rb_using_module): clear method cache after applying
  refinements.

* eval.c (mod_using, top_using): remove redundant type checks.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44169 b2dd03c8-39d4-4d8f-98ff-823fe69b080e