[llvm] [NVPTX] Propagate truncate to operands (PR #98666)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

> > The DAGCombiner has the same combine: https://github.com/llvm/llvm-project/blob/ae63db78828621feca713016e33f34717da626a5/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp#L15170
> 
> Interesting, then the question is -- why it apparently doesn't it fire in NVPTX. That may be what needs fixing.

It expects one of the parameters of the binop to be constant. This combine seems to be less restrictive.

https://github.com/llvm/llvm-project/pull/98666