[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

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