[llvm] [KnownBits] Remove `hasConflict()` assertions (PR #94568)

[via llvm-commits]

c8ef wrote:

> These assertions are not just in KnownBits.h, but also spread across many other places. Basically do a `git grep "hasConflict()"` (There are currently 88 occurrences, though not all of them are in assertions.)

I removed more assertions in other files.

https://github.com/llvm/llvm-project/pull/94568