[llvm] [InstCombine] Fold selection between less than zero and one (PR #69961)

[via llvm-commits]

XChy wrote:

> >     return SelectInst::Create(Cond, LArm, RArm);


And a ZExt instruction should be emitted here, surrounding the whole select.

https://github.com/llvm/llvm-project/pull/69961