ruby.h: optimize rb_scan_args_set
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55150 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
ruby.h: optimize rb_scan_args_set
adjusting argc for an option hash, for optimization in simpler
cases.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55150 b2dd03c8-39d4-4d8f-98ff-823fe69b080e