[llvm] [Code Coverage] Add a tool to check test coverage of a patch (PR #71841)

[Shivam Gupta via llvm-commits]

xgupta wrote:

Hi All,

I have run the tool on GitHub CI for patch - https://github.com/llvm/llvm-project/pull/72273.

There are three lines not covered by any test case -
https://github.com/xgupta/llvm-project/actions/runs/6960437175/job/18939925358#step:5:2614

This is a patch with .ll test case and opt binary. Tomorrow I will run it for a patch with .c & .cpp test case and clang binary and share the result.


https://github.com/llvm/llvm-project/pull/71841