Merge "Define LIKELY and UNLIKELY in a vendor friendly way"

  ((sizeof(a) / sizeof(*(a))) / \

    static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))))

#define LIKELY(x) __builtin_expect((x), true)

#define UNLIKELY(x) __builtin_expect((x), false)

// Changing this definition will cause you a lot of pain.  A majority of

// vendor code defines LIKELY and UNLIKELY this way, and includes

// this header through an indirect path.

#define LIKELY( exp )       (__builtin_expect( (exp) != 0, true  ))

#define UNLIKELY( exp )     (__builtin_expect( (exp) != 0, false ))

#define WARN_UNUSED __attribute__((warn_unused_result))