Align the memory allocation in the cbrt() unit test to prevent FPEs in the...

Align the memory allocation in the cbrt() unit test to prevent FPEs in the peel and remainder loops.

tests/testCbrt.c

@@ -50,7 +50,8 @@ int main(int argc, char *argv[]) {
   message("executing %i runs of each command.", num_vals);
 
   /* Create and fill an array of floats. */
-  float *volatile data = (float *)malloc(sizeof(float) * num_vals);
+  float *data;
+  posix_memalign((void **)&data, 64, num_vals*sizeof(float));
   for (int k = 0; k < num_vals; k++) {
     data[k] = (float)rand() / RAND_MAX;
     data[k] = (1.0f - data[k]) * range_min + data[k] * range_max;