Ruby

• array.c (rb_ary_set_len): new function to set array length.
• vm_eval.c (method_missing): set the length of argv array, to mark
  arguments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32740 b2dd03c8-39d4-4d8f-98ff-823fe69b080e