[llvm] [DAGCombiner] infer wrap flags for trunc, use to fold itofp (PR #148729)

[Alex MacLean via llvm-commits]

AlexMaclean wrote:

Unfortunately, applying these wrap flags seems to cause regressions in many tests across several targets. I don't have the bandwidth to track down and fix whatever is going on with these so abandoning this for now. 

https://github.com/llvm/llvm-project/pull/148729