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0c47091006
It's a function that prints numbers with underscores inserted for readability (e.g. "1_234_567"), used by `-Zmeta-stats` and `-Zinput-stats`. It's the only thing in `rustc_middle::util::common`, which is a bizarre location for it. This commit: - moves it to `rustc_data_structures`, a more logical crate for it; - puts it in a module `thousands`, like the similar crates.io crate; - renames it `format_with_underscores`, which is a clearer name; - rewrites it to be more concise; - slightly improves the testing.