[flang-commits] [flang] Reapply "[flang] Improve debug info for functions." with regression fixed. (PR #90484)

[Daniel Chen via flang-commits]

DanielCChen wrote:

@abidh My local build started to see some failures like
```
llvm-project/flang/lib/Optimizer/Transforms/AddDebugInfo.cpp:148:26: error: 'dyn_cast' is deprecated: Use mlir::dyn_cast<U>() instead [-Werror,-Wdeprecated-declarations]
    if (auto funcLoc = l.dyn_cast<mlir::FileLineColLoc>())
                         ^
```

Is it something related to this PR?

https://github.com/llvm/llvm-project/pull/90484