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

[Ankur raj via cfe-commits]

ankurrj7 wrote:

I updated the profile hash so that every emitted call-continuation counter contributes to it. Previously, the hash only recorded that call continuations were enabled, so adding another continuation counter could leave two different counter layouts with the same hash. The regression test now covers both the one-call and extra-call cases.

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