Ruby

array.c: fix array size overflow

• array.c (ary_ensure_room_for_push): check if array size will
  exceed maxmum size to get rid of buffer overflow.
  [ruby-dev:49043] [Bug #11235]
• array.c (ary_ensure_room_for_unshift, rb_ary_splice): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e