Bug for update pc fixed and Add support VM inst
original commit by miura1729
https://github.com/miura1729/mruby/commit/1bf72656e1b38f3b84687ab78261f25ee1b25d46
Some bugs fixed. Can execute ao-render.rb (maybe...). But very slow
original commit by miura1729
https://github.com/miura1729/mruby/commit/721df7a5a25dcb2c2d83ca677063bb35daef2754