[clang] [llvm] [clang][coverage] Add opt-in call continuation counters for coverage (PR #201079)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> However, I confess that I'm slightly concerned about adding another distinct coverage mode in general. We should introduce such complexity with caution and only when reasonably certain it cannot be solved with a mapping change alone. That is, of course, nothing but my opinion. I cede completely to @evodius96 and @chapuni in that regard.

Code coverage is not my area of expertise, but I share this concern -- this seems like something we'd usually have an RFC for visibility and to ensure there's sufficient community buy-in. However, I leave it to the judgement of @evodius96 and @chapuni whether they agree or not (maybe I see this as a bigger feature than they do).

https://github.com/llvm/llvm-project/pull/201079