[llvm] [ValueTracking] Refactor `isKnownNonEqualFromContext` (PR #127388)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> Could you kindly add the NFC tag to the title? It's not obvious that this patch is an NFC, although the patch summary has an explanation.

It is not NFC. See https://github.com/dtcxzyw/llvm-opt-benchmark/pull/2121. The net effect is positive.


https://github.com/llvm/llvm-project/pull/127388