[flang-commits] [flang] [flang] Add options -W[no-]unused-dummy-argument and -W[no-]unused-variable (PR #127214)

[Tarun Prabhu via flang-commits]

tarunprabhu wrote:

> (or similar *.td file)

>From `clang/docs/CMakeLists.txt`
```
gen_rst_file_from_td(DiagnosticsReference.rst -gen-diag-docs ../include/clang/Basic/Diagnostic.td "${docs_targets}")
```

@JDPailleux, will you be looking into a different way of structuring the warning flags as part of this patch? 

I have requested reviews from others for the non-driver parts of this PR. 

https://github.com/llvm/llvm-project/pull/127214