[flang-commits] [flang] [flang][debug] Generate DWARF debug info using fir.use_stmt. (PR #168541)

[Tom Eccles via flang-commits]

https://github.com/tblah approved this pull request.

LGTM with some very minor nits.

It would be best if this could also be reviewed by somebody with more expertise in DWARF than I have, but in the absence of such a reviwer I think this looks good so far as I can tell.

https://github.com/llvm/llvm-project/pull/168541