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James Zern authored
For 8-bit the subtrahend is small enough to fit into uint32_t. cherry-picked from libvpx: 47b9a0912 Resolve -Wshorten-64-to-32 in highbd variance. This is the same that was done for: c0241664a Resolve -Wshorten-64-to-32 in variance. For 10/12-bit apply: 63a37d16f Prevent negative variance BUG=aomedia:445 Change-Id: Iab35e3f3f269035e17c711bd6cc01272c3137e1d
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