[ruby-core:114847] [Ruby master Bug#19896] Ruby method refinement memory leak

Issue #19896 has been reported by HParker (Adam Hess).

----------------------------------------
Bug #19896: Ruby method refinement memory leak
https://bugs.ruby-lang.org/issues/19896

* Author: HParker (Adam Hess)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
GitHub pull request: https://github.com/ruby/ruby/pull/8487

When method redefinitions happen, sometimes the final definition does not get cleaned up,

Reproducable with the same script from: https://bugs.ruby-lang.org/issues/19894

``` ruby
10.times do
  20_000.times do
    $c = Class.new do
      def foo; end
    end

    $m = Module.new do
      refine $c do
        def foo; end
      end
    end

    Class.new do
      using $m

      def initialize
        o = $c.new
        o.method(:foo).unbind
      end
    end.new
  end

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

before:

```
19792
20944
22224
23504
24784
26064
27344
28624
29776
31056
```

after:

```
18560
18560
18560
18560
18560
18560
18560
18560
18560
18560
```




-- 
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