diff: use large integers for diffstat calculations
The diffstat "added" and "changed" fields generally store line counts; however, for binary files, they store file sizes. Since we store and print these values as ints, a diffstat on a file larger than 2G can show a negative size. Instead, let's use uintmax_t, which should be at least 64 bits on modern platforms. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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