[LLVM][Coverage][Unittest] Fix dangling reference in unittest (#147118) In loop of `writeAndReadCoverageRegions`, `OutputFunctions[I].Filenames` references to contents of `Filenames` after returning from `readCoverageRegions` but `Filenames` will be cleared in next call of `readCoverageRegions`, causes dangling reference. The lifetime of the contents of `Filenames` must be equal or longer than `OutputFunctions[I]`, thus it has been moved into `OutputFunctions[I]` (typed `OutputFunctionCoverageData`).
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