Need -line-coverage-lt and -line-coverage-gt of llvm-com analogues

[DmitryJustDmitry]

Hi, could you please add options like -line-coverage-lt and -line-coverage-gt of llvm-com (https://llvm.org/docs/CommandGuide/llvm-cov.html#cmdoption-llvm-cov-show-line-coverage-lt).

If you gave me some kickstart how and where to realize it in your paradygm (Classes, Functions e.tc.), i could try to make Pull Request by myself.

[ffMathy]

PRs are definitely welcome.

If you just try to make the code look like the existing code already there, we'll take it from there once you make a PR.

The code shouldn't be too complex to understand.