Function mulhilo

src/backend/oneapi/kernel/random_engine_philox.hpp:63–66

constexpr uint w32_1   = 0xBB67AE85;

static inline void mulhilo(uint a, uint b, uint& hi, uint& lo) {
    hi = sycl::mul_hi(a, b);
    lo = a * b;
}

static inline void philoxBump(uint k[2]) {
    k[0] += w32_0;