LineCoverageIterator is not providing access to a mutable object. Fix it
to iterate over `const LineCoverageStats` so that `operator->()`
compiles again after
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| .. | ||
| CMakeLists.txt | ||
| CoverageMappingTest.cpp | ||
| InstrProfDataTest.cpp | ||
| InstrProfTest.cpp | ||
| SampleProfTest.cpp | ||