count of bits set in a long

[Rich Salz]

X11R4/src/mit/server/dix/devices.c:
    int
    Ones(mask)                /* HACKMEM 169 */
	Mask mask;
    {
	register Mask y;

	y = (mask >> 1) &033333333333;
	y = mask - y - ((y >>1) & 033333333333);
	return (((y + (y >> 3)) & 030707070707) % 077);
    }

X11R4/src/mit/X11/X.h:
    typedef unsigned long Mask;
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