[llvm] [coverage] llvm-cov export parallel load (PR #193726)

[via llvm-commits]

patskovn wrote:

Hello, @weliveindetail and @chapuni !
Unfortunately I can't add reviewers here directly and I found you as the most appropriate owners of this part of codebase skimming through git history. Sorry for tagging directly and appreciate you taking a look when you have some time

https://github.com/llvm/llvm-project/pull/193726