[llvm] [ValueTracking] Support horizontal vector add in computeKnownBits (PR #174410)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw commented:

You can have a look at https://github.com/llvm/llvm-project/pull/88410 if you need more tests.

https://github.com/llvm/llvm-project/pull/174410