Refs #727. Align stack buffer address on 32-bytes.

common_stackalloc.h

@@ -54,7 +54,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   if(stack_alloc_size > MAX_STACK_ALLOC / sizeof(TYPE))                    \
     stack_alloc_size = 0;                                                  \
   STACK_ALLOC_PROTECT_SET                                                  \
-  TYPE stack_buffer[stack_alloc_size];                                     \
+  TYPE stack_buffer[stack_alloc_size] __attribute__((aligned(0x20)));    \
   BUFFER = stack_alloc_size ? stack_buffer : (TYPE *)blas_memory_alloc(1);
 #else
   //Original OpenBLAS/GotoBLAS codes.