[llvm-cgdata] Fix Dangling StringRefs #143210
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`OutputFilename` and `Filename` are assigned to StringRefs in `parseArgs`, but after `parseArgs` returns the `InputArgsList` that once owned the underlying strings is popped off the stack, and the StringRefs can be left pointing at garbage. Switch to std::string to own the strings.
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OutputFilenameandFilenameare assigned to StringRefs inparseArgs, but afterparseArgsreturns theInputArgsListthat once owned the underlying strings is popped off the stack, and the StringRefs can be left pointing at garbage.Switch to std::string to own the strings.