[ruby-core:117265] [Ruby master Bug#20228] Memory leak in Regexp timeout

Issue #20228 has been updated by naruse (Yui NARUSE).

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

ruby_3_3 c626c201e4129bbea17583ecef73472c6f668c81 merged revision(s) 01bfd1a2bf013a9ed92a9722ac5228187e05e6a8,1c120efe02d079b0a1dea573cf0fd7978d9cc857,31378dc0969f4466b2122d730b7298dd7004acdf.

----------------------------------------
Bug #20228: Memory leak in Regexp timeout
https://bugs.ruby-lang.org/issues/20228#change-107359

* Author: peterzhu2118 (Peter Zhu)
* Status: Closed
* Backport: 3.0: UNKNOWN, 3.1: DONTNEED, 3.2: REQUIRED, 3.3: DONE
----------------------------------------
GitHub PR: https://github.com/ruby/ruby/pull/9765

If a Regexp::TimeoutError is raised, the `stk_base` and `OnigRegion` will leak.

For example:

```ruby
Regexp.timeout = 0.001
regex = /^(a*)*$/
str = "a" * 1000000 + "x"

10.times do
  100.times do
    begin
      regex =~ str
    rescue
    end
  end

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

Before:

```
328800
632416
934368
1230448
1531088
1831248
2125072
2414384
2703440
2995664
```

After:

```
39280
47888
49024
56240
56496
56512
56592
56592
56720
56720
```



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