Use these macros to tell the compiler about conditions that may
happen, so it will generate better code. But do not assume that they
will do anything special.
Change-Id: I89ec4f65f48a9340ccf5ffc4ae4b8c3d8897c8b1
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>