LLVM cherry pick for Swift 5.2 branch

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I was wondering if we could cherry pick [llvm-cov[ Fix lcov coverage report contains functions from other com… · apple/llvm-project@176b9f6 · GitHub into the Swift 5.2 branch. It's a bugfix for producing lcov reports with llvm-cov that in our case turns 45GB coverage files into just a few megabytes.

cc @dexonsmith since you're listed as the release manager for this repo

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I would recommend that you create a PR for that on the appropriate branch on the apple/llvm-project (preferably with cherry-pick -x).

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Ah cool, I wasn't sure what the best practice was here. I've submitted [llvm-cov] Fix lcov coverage report contains functions from other compilation units. by keith · Pull Request #622 · apple/llvm-project · GitHub