ruby/ruby — pull request #546 by ksss (2014-02-24 14:31:15+00:00)
Title: * include/ruby/ruby.h (RARRAY_LEN):  change more faster get embed array length

i try benchmark this change.

```ruby
require 'benchmark'

n = 10000000

Benchmark.bm do |x|
GC.start
empty_time = x.report("empty"){n.times{ }}
GC.start
embed_time = x.report("embed length"){n.times{ [].length }}
puts embed_time.real / empty_time.real
end
```

result of 10 times average.

before: 1.681396211600276
after: 1.6629606856866217

it's more faster but just a little :ant: