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549       unsigned SignBits = KnownZeroTemp.countLeadingOnes();
550       KnownZero |= APInt::getHighBitsSet(BitWidth, SignBits);
559       unsigned SignBits = KnownZeroTemp.countLeadingOnes();
561         SignBits++;
562       KnownZero |= APInt::getHighBitsSet(BitWidth, SignBits);