Issue #17135 has been reported by S_H_ (Shun Hiraoka).

----------------------------------------
Feature #17135: Improve perfomance for Integer#size method
https://bugs.ruby-lang.org/issues/17135

* Author: S_H_ (Shun Hiraoka)
* Status: Open
* Priority: Normal
----------------------------------------
`Integer#size` seem can improve parfomance by write in ruby code.

benchmark:

```yml
prelude: |
  n = 42
benchmark:
  size: |
    n.size
loop_count: 20000000
```

result:

```bash
sh@MyComputer:~/rubydev/build$ make benchmark/integer_size.yml -e COMPARE_RUBY=~/.rbenv/shims/ruby -e BENCH_RUBY=../install/bin/ruby
# Iteration per second (i/s)

|      |compare-ruby|built-ruby|
|:-----|-----------:|---------:|
|size  |     65.749M|   87.117M|
|      |           -|     1.33x|
```

`COMPARE_RUBY` is `ruby 2.8.0dev (2020-08-28T10:47:29Z master 7e1fddba4a) [x86_64-linux]`. `BENCH_RUBY` is patched.






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