[ruby-core:117164] [Ruby master Bug#20161] Memory leak in regexp grapheme clusters

Issue #20161 has been updated by naruse (Yui NARUSE).

Backport changed from 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED to 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE, 3.3: DONE

ruby_3_3 577f9c7a8334bb33512f01e7db95f6fb15e280b2 merged revision(s) 37ed86fd3c798e298fad9db6e7df1f3f45e1e03b.

----------------------------------------
Bug #20161: Memory leak in regexp grapheme clusters
https://bugs.ruby-lang.org/issues/20161#change-107255

* Author: peterzhu2118 (Peter Zhu)
* Status: Closed
* Backport: 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE, 3.3: DONE
----------------------------------------
GitHub PR: https://github.com/ruby/ruby/pull/9447

The cc->mbuf gets overwritten, so we need to free it to not leak memory.

For example:

```ruby
str = "hello world".encode(Encoding::UTF_32LE)

10.times do
  1_000.times do
    str.grapheme_clusters
  end

  puts `ps -o rss= -p #{$$}`
end
```

Before:

```
15536
15760
15920
16144
16304
16480
16640
16784
17008
17280
```

After:

```
15584
15584
15760
15824
15888
15888
15888
15888
16048
16112
```



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