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3ab1a8a75e
This reverts part of D81156. Accessing errs() concurrently was safe before and racy after D81156. (`errs() << 'a'` is always racy) Accessing outs() and errs() concurrently was safe before and racy after D81156. Don't tie errs() to outs() by default to fix the fallout. llvm-dwarfdump is single-threaded and opting in the tie behavior is safe.