[ruby-core:87375] [Ruby trunk Feature#14820] [PATCH] ipaddr.rb: use frozen_string_literal

Issue #14820 has been reported by normalperson (Eric Wong).

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Feature #14820: [PATCH] ipaddr.rb: use frozen_string_literal
https://bugs.ruby-lang.org/issues/14820

* Author: normalperson (Eric Wong)
* Status: Open
* Priority: Normal
* Assignee: knu (Akinori MUSHA)
* Target version: 
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```
ipaddr.rb: use frozen_string_literal

This reduces GC count by around 10% and provides a tiny speedup.

"make exam" passes, and I've read every single line of ipaddr.rb
so it APPEARS safe.  An extra set of eyes would be appreciated.

==> i.rb <==
500_000.times do
  IPAddr.new(-"3ffe:505:2::1")
  IPAddr.new(-"192.168.2.0/24")
end
p GC.count

  $ /usr/bin/time ./ruby i.rb
  4058
  11.16user 0.33system 0:11.50elapsed 99%CPU (0avgtext+0avgdata 10160maxresident)k
  0inputs+0outputs (0major+1390minor)pagefaults 0swaps

  $ /usr/bin/time ./ruby -I lib i.rb
  3651
  10.97user 0.32system 0:11.30elapsed 99%CPU (0avgtext+0avgdata 10196maxresident)k
  0inputs+0outputs (0major+1377minor)pagefaults 0swaps
```


---Files--------------------------------
0001-ipaddr.rb-use-frozen_string_literal.patch (1.17 KB)


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