[ruby-core:104057] [Ruby master Bug#17887] Missed constant lookup after prepend

Issue #17887 has been updated by alanwu (Alan Wu).

ruby -v changed from 3.0.0 to 2.6.x-3.0.x

I also think that the same `.ancestors` should yield the same constant lookup result.
It would be harder for users to predict constant lookup otherwise. 

By the way, the repro script has behaved the same since [Ruby 2.2.6](https://wandbox.org/permlink/ny0oTevcLH655R2Y).


----------------------------------------
Bug #17887: Missed constant lookup after prepend
https://bugs.ruby-lang.org/issues/17887#change-92199

* Author: bjfish (Brandon Fish)
* Status: Open
* Priority: Normal
* ruby -v: 2.6.x-3.0.x
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
**Description**
The following shows that the constant lookup from B does not find the constant in the prepended M module.  I would expect this lookup to behave like "B.include M" which does print the constant from module M.


**Example**
``` ruby
module M
  FOO = 'm'
end
class A
  FOO = 'a'
end
class B < A
  def foo
    FOO
  end
end
b = B.new
p b.foo
A.prepend M
p b.foo
```
**Expected Result**
```
"a"
"m"
```
**Actual Result**
```
"a"
"a"
```




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