[ruby-core:106801] [Ruby master Bug#17725] Prepend breaks ability to override optimized methods

Issue #17725 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED to 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED

I gave up to find a workaround. I will backport fb4cf204a662a8cd9dafef6f31f2bd0db9129abe and fa0279d947c3962c3f8c32852278d3ebb964cb19 even though they introduce an incompatibility. I believe the incompatibility (the Array#size is going to have an independent method entry instead of being defined as the alias of Array#length) couldn't cause any problem in the real world applications...

----------------------------------------
Bug #17725: Prepend breaks ability to override optimized methods
https://bugs.ruby-lang.org/issues/17725#change-95610

* Author: joshuadreed (Josh Reed)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19]
* Backport: 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED
----------------------------------------
Prepending any module to `String` and `Hash` (and possibly other or all classes?) blocks the ability to `alias` 

As an example:
``` ruby
module Dummy; end
# String.prepend(Dummy)
class String
  alias_method(:old_plus, :+)
  def + other
    puts 'blah blah'
    old_plus(other)
  end
end

'a' + 'b'

> blah blah
```

``` ruby
module Dummy; end
String.prepend(Dummy)
class String
  alias_method(:old_plus, :+)
  def + other
    puts 'blah blah'
    old_plus(other)
  end
end

'a' + 'b'

>
```

Prepending after an `alias` does not affect the previous `alias`



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