[llvm] [AArch64] Match BSP through trunc(and) canonicalization in OR combine (PR #198277)

[Rajveer Singh Bharadwaj via llvm-commits]

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Rajveer100 wrote:

Unless I missed, we need test cases for:

```
(or (trunc (and B A)) (and C (xor (trunc A) -1)))
(or (trunc (and B A)) (and C (xor (trunc B) -1)))
(or (trunc (and A B)) (and C (xor (trunc B) -1)))
```

and other similar ones.

https://github.com/llvm/llvm-project/pull/198277