[llvm] [ValueTracking] Improve `Bitcast` handling to match SDAG (PR #125935)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw approved this pull request.

LG. See also my comments on the pre-commit tests https://github.com/llvm/llvm-project/pull/144111.


https://github.com/llvm/llvm-project/pull/125935