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5974dfc782
I was investigating a change previously discussed that eliminates an excessive empty lines from the output when we report warnings and errors (https://reviews.llvm.org/D70826#inline-639055) and found that we need this refactoring or alike to achieve that. The problem is that some of our functions that finds symbol versions just fail instead of returning errors or printing warnings. Another problem is that they might print a warning on the same line with the regular output. In this patch I've splitted getting of the version information and dumping of it for GNU printVersionSymbolSection(). I had to change a few methods to return Error or Expected<> to do that properly. Differential revision: https://reviews.llvm.org/D71118