[llvm] Fix Failure to fold (and %x, (sext i1 %m)) -> (select %m, %x, 0) with multiple uses of %m Resolve #81288 (PR #81409)

[Nikita Popov via llvm-commits]

nikic wrote:

Actually, it looks like there are two legitimate test failures:
```
Failed Tests (2):
  LLVM :: Transforms/InstCombine/binop-cast.ll
  LLVM :: Transforms/InstCombine/sub-ashr-and-to-icmp-select.ll
```
Can you please update these tests as well?

https://github.com/llvm/llvm-project/pull/81409