Constant crypto::sha2::K64X2

pub const K64X2: [u64x2; 40] = [u64x2(K64[1], K64[0]), u64x2(K64[3], K64[2]), u64x2(K64[5], K64[4]),
 u64x2(K64[7], K64[6]), u64x2(K64[9], K64[8]), u64x2(K64[11], K64[10]),
 u64x2(K64[13], K64[12]), u64x2(K64[15], K64[14]), u64x2(K64[17], K64[16]),
 u64x2(K64[19], K64[18]), u64x2(K64[21], K64[20]), u64x2(K64[23], K64[22]),
 u64x2(K64[25], K64[24]), u64x2(K64[27], K64[26]), u64x2(K64[29], K64[28]),
 u64x2(K64[31], K64[30]), u64x2(K64[33], K64[32]), u64x2(K64[35], K64[34]),
 u64x2(K64[37], K64[36]), u64x2(K64[39], K64[38]), u64x2(K64[41], K64[40]),
 u64x2(K64[43], K64[42]), u64x2(K64[45], K64[44]), u64x2(K64[47], K64[46]),
 u64x2(K64[49], K64[48]), u64x2(K64[51], K64[50]), u64x2(K64[53], K64[52]),
 u64x2(K64[55], K64[54]), u64x2(K64[57], K64[56]), u64x2(K64[59], K64[58]),
 u64x2(K64[61], K64[60]), u64x2(K64[63], K64[62]), u64x2(K64[65], K64[64]),
 u64x2(K64[67], K64[66]), u64x2(K64[69], K64[68]), u64x2(K64[71], K64[70]),
 u64x2(K64[73], K64[72]), u64x2(K64[75], K64[74]), u64x2(K64[77], K64[76]),
 u64x2(K64[79], K64[78])]

Constants necessary for SHA-512 family of digests.