llvm-project

a21f13bd - llvm-cov: Refactor CoverageSummaryInfo. NFC. (#121189)

llvm-cov: Refactor CoverageSummaryInfo. NFC. (#121189) - Let subfunctions return `CoverageInfo` objects w/o accumulating reference values. - Introduce `CoverageDataSummary` for handling `CoverageData`-oriented metrics.