[llvm] [AVR] Fix a bug in selection of ANY_EXTEND (PR #132398)

[Patryk Wychowaniec via llvm-commits]

Patryk27 wrote:

Minimized test case:
```llvm
define i16 @main(i8 %a, i16 %b) {
  %1 = zext i8 %a to i16
  %2 = sub nsw i16 %1, %b
  %3 = and i16 %2, 1

  ret i16 %3
}
```
I'll play a bit and see if I can dig to the underlying issue.

https://github.com/llvm/llvm-project/pull/132398