Silence compiler warning. NFC.

The idiom

    for (auto i = n - n; i < n; i += 1)

was intended to automatically derive the type of i from n
(signed/unsigned int) and avoid the 'mixed signed/unsigned comparison'
warning. However, almost-always-auto was never used in the LLVM coding
style (although we used it in Polly for some time) and I did never
intended to use this idiom upstream.

PVS Studio may warns about this idiom as 'warning: both sides of
operator are equivalent [misc-redundant-expression]'.

Remove the use of auto and directly use unsigned.

Also see http://llvm.org/PR44768

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