LineCoverageIterator is not providing access to a mutable object. Fix it to iterate over `const LineCoverageStats` so that `operator->()` compiles again after 6b9b86db9dd974585a5c71cf2e5231d1e3385f7c.
LineCoverageIterator is not providing access to a mutable object. Fix it to iterate over `const LineCoverageStats` so that `operator->()` compiles again after 6b9b86db9dd974585a5c71cf2e5231d1e3385f7c.