[flang-commits] [flang] [flang][CodeGen] add nsw to address calculations (PR #74709)

[Slava Zakharin via flang-commits]

vzakhari wrote:

Thank you for the changes, Tom.  It looks good to me.  I just want to clarify that this is not the place that I talked about in the RFC.  I was talking about setting `nsw` on the do-variable increment that is generated by the loop lowering.  Adding `nsw` there is what enables the hoisting I mentioned in the RFC - in this case, the `nsw`s on the address computations might be not that important, because LLVM was able to optimize without them.

https://github.com/llvm/llvm-project/pull/74709