Fix compilation errors

Fix compilation errors

CMM_{STORE,LOAD}_SHARED() accept expressions.  However,
uatomic_{load,store} accept address.  To pass from the latter to the
former, a dereference is necessary.

Furthermore, the C11 compatibility layer for x86.h on store operations
was wrongly named after the `set' operation.

Change-Id: Icb1468de3de4878b5744e632314aa8332ad7fe26
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>