[llvm] [llvm-dwarfdump][LineCov 1/3] Add variable coverage metrics (PR #169646)

[Stephen Tozer via llvm-commits]

https://github.com/SLTozer commented:

A few more comments, largely this LGTM besides some nit comments and one real functional question regarding variables without DW_AT_location.

https://github.com/llvm/llvm-project/pull/169646