[llvm-cov] Avoid over-counting covered lines and regions* Fix an unsigned integer overflow in the logic that computes the number of uncovered lines in a function.* When aggregating region and l
[llvm-cov] Avoid over-counting covered lines and regions* Fix an unsigned integer overflow in the logic that computes the number of uncovered lines in a function.* When aggregating region and line coverage summaries, take into account that different instantiations may have a different number of regions.The new test case provides test coverage for both bugs. I also verifiedthis change by preparing a coverage report for a stage2 build of llc --the new assertions should detect any outstanding over-counting bugs.Fixes PR34613.llvm-svn: 313417
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