[ruby-core:102631] [Ruby master Feature#17660] Expose information about which basic methods have been redefined

Issue #17660 has been reported by tenderlovemaking (Aaron Patterson).

----------------------------------------
Feature #17660: Expose information about which basic methods have been redefined
https://bugs.ruby-lang.org/issues/17660

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
I would like to tell if code is redefining methods that can impact
MRI's optimizations.  This commit exposes which basic methods have been
redefined.  For example:

```ruby
class Integer
  def +(x); x ** self; end
end

p RubyVM.redefined_methods # => {Integer=>[:+]}
```

This will allow us to prevent basic method redefinitions from happening
by checking for them in CI environments.  For example:

```ruby
Minitest.after_run {
  fail "Basic methods have been redefine" if RubyVM.redefined_methods.any?
}
```



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