Function fast_hash32

src/fl/stl/hash.h:81–88

----------------------------------------------------------------------------- Fast, cheap 32-bit integer hash (Thomas Wang) -----------------------------------------------------------------------------

// Fast, cheap 32-bit integer hash (Thomas Wang)
//-----------------------------------------------------------------------------
static inline u32 fast_hash32(u32 x) FL_NOEXCEPT {
    x = (x ^ 61u) ^ (x >> 16);
    x = x + (x << 3);
    x = x ^ (x >> 4);
    x = x * 0x27d4eb2dU;
    x = x ^ (x >> 15);
    return x;
}

// 3) Handy two-word hasher
static inline u32 hash_pair(u32 a, u32 b,