[llvm] [llvm-cov] format cells in code coverage report with 0/0 branches/functions/lines differently (PR #75780)

[Hana Dusíková via llvm-commits]

hanickadot wrote:

I'm sorry I didn't notice you already looked into it, and I added also sorting mechanism. Can you look at it too?

https://github.com/llvm/llvm-project/pull/75780