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6566ffdf8a
There was a problem with `llvm-gsymutil`s error aggregation code not properly collecting aggregate errors. The was that the output aggregator collecting errors from other threads wasn't being passed by reference, so it was merging them into a copy of the app-wide output aggregator. While I was at it, I added a better comment above the "Merge" code and made it a bit more efficient, after learning more details about `emplace` vs. `insert` or `operator[]` on `std::map`'s. Co-authored-by: Kevin Frei <freik@meta.com>