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Undoes most of #4347, because of [performance complaints](https://discord.com/channels/655572317891461132/707150492370862090/1295527235133898772). With a 30-ish frame stack trace and `-c dbg`, my installed `llvm-symbolizer` still seems slow (~6s), but the hermetic `llvm-symbolizer` adds ~4s (i.e., ~10s total). I don't think we can easily force the hermetic version to build in opt configuration, so I'm backing it out.