[llvm] [DA] Rewrite BanerjeeMIV test with safe APInt interval arithmetic (PR #207662)

[Ryotaro Kasuga via llvm-commits]

https://github.com/kasuga-fj commented:

Overall, could you please address the following points?

- Please add more comments, especially at the beginning of functions.
- Please leave existing comments unchanged unless they need to be modified.

https://github.com/llvm/llvm-project/pull/207662