Move test fixtures to samples/

samples/opencl/fft.cl

@@ -0,0 +1,13 @@
+double run_fftw(int n,const float * x,float * y)
+{
+  fftwf_plan p1 = fftwf_plan_dft_1d(n,(fftwf_complex *)x,(fftwf_complex *)y,
+                      FFTW_FORWARD,FFTW_ESTIMATE);
+  const int nops = 10;
+  double t = cl::realTime();
+  for (int op = 0;op < nops;op++) {
+    fftwf_execute(p1);
+  }
+  t = (cl::realTime() - t)/(double)nops;
+  fftwf_destroy_plan(p1);
+  return t;
+}