mruby/mruby — pull request #2420 by ksss (2014-06-24 21:23:02+00:00)
Title: Not create local variables in scope_new

Reduce malloc for lv like that syntax.

```ruby
# '|' opt_bv_decl '|'
3.times do|
|end
# tOROP
Proc.new{||}
```

And it can help to notice which OP_ENTER was run or not because irep->lv == 0.