[llvm] [InstCombine]: Replace overflow calculation with intrinsic (PR #168195)

[Kevin Per via llvm-commits]

kper wrote:

Thanks @nikic for the review!
But, it seems like that it has no improvements in https://github.com/dtcxzyw/llvm-opt-benchmark/pull/3077
So, I would propose to close the PR. Or do you think that this transformation should exist, nonetheless?

https://github.com/llvm/llvm-project/pull/168195