For crash reduction, I don't think it does anything that llvm-reduce can't. Pass pipeline reduction also has a separate reduction script. The main thing there isn't a replacement tool is the miscompilation reducer, but I'm not sure that's actually functioned for years. There are still some references to bugpoint in various comments and pieces of documentation that don't all necessarily make sense to replace or remove. In particular there are a few passes documented as "only for bugpoint", but I've left those alone in case they are useful for manual reductions.
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