[ruby-core:116073] [Ruby master Bug#20161] Memory leak in regexp grapheme clusters

Issue #20161 has been reported by peterzhu2118 (Peter Zhu).

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

* Author: peterzhu2118 (Peter Zhu)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED
----------------------------------------
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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