[llvm] [ValueTracking] Handle assume( trunc x to i1) (PR #118406)

[Andreas Jonson via llvm-commits]

andjo403 wrote:

even if there maybe is problems with ephemeral values resulting in not all assumes is used,
as it is now all assumes that have a trunc argument is unused as this code is missing.

https://github.com/llvm/llvm-project/pull/118406