fixed a bug in opencl_nvidia sgemm. We were freeing params before writing...

fixed a bug in opencl_nvidia sgemm. We were freeing params before writing output file, which was not generating correct output

llvm/test/VISC/parboil/benchmarks/sgemm/src/opencl_nvidia/main.cc

@@ -193,7 +193,6 @@ main (int argc, char *argv[]) {
     
   pb_SwitchToTimer(&timers, pb_TimerID_NONE);
   pb_PrintTimerSet(&timers);
-  pb_FreeParameters(params);
 
   if (params->outFile) {
     /* Write C to file */
@@ -202,6 +201,7 @@ main (int argc, char *argv[]) {
 	matArow, matBcol, matC); 
   }
 
+  pb_FreeParameters(params);
 
   double GPUtime = pb_GetElapsedTime(&(timers.timers[pb_TimerID_KERNEL]));
   std::cout<< "GFLOPs = " << 2.* matArow * matBcol * matAcol/GPUtime/1e9 << std::endl;