[clang] [Coverage] Add a new flag to split region after every call. (PR #90031)

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c01db33f wrote:

Something has broken; this worked in the test that I tried previously, but it's not working correctly on the example I tried to day, so I need to investigate what's going on more closely. Closing this PR for now, I'll open a new one if I can get it working correctly.

https://github.com/llvm/llvm-project/pull/90031