[flang-commits] [flang] [flang] add nsw to operations in subscripts (PR #110060)

[Tom Eccles via flang-commits]

https://github.com/tblah commented:

The changes look good in themselves but I wonder if this would be better in `fir::FirOpBuilder::setCommonAttributes` so that it is done on all new eligible operations instead of only in lowering.

https://github.com/llvm/llvm-project/pull/110060