Report CPU freq as measured by rdtsc

It makes issues like rurban#241 more visible

SpeedTest.cpp

@@ -284,18 +284,20 @@ void BulkSpeedTest ( pfHash hash, uint32_t seed )
 
   volatile double warmup_cycles = SpeedTest(hash,seed,trials,blocksize,0);
 
+  const double MHz2MiBps = (1000.0 * 1000.0) / (1024.0 * 1024.0);
   for(int align = 7; align >= 0; align--)
   {
     double cycles = SpeedTest(hash,seed,trials,blocksize,align);
 
     double bestbpc = double(blocksize)/cycles;
-
-    double bestbps = (bestbpc * 3000000000.0 / 1048576.0);
-    printf("Alignment %2d - %6.3f bytes/cycle - %7.2f MiB/sec @ 3 ghz\n",align,bestbpc,bestbps);
+    const unsigned cpuMHz = GetCpuFreqMHz();
+    double bestbps = (bestbpc * cpuMHz * MHz2MiBps);
+    printf("Alignment %2d - %6.3f bytes/cycle - %7.2f MiB/sec @ %u MHz\n",align,bestbpc,bestbps,cpuMHz);
     sumbpc += bestbpc;
   }
+  const unsigned cpuMHz = GetCpuFreqMHz();
   sumbpc = sumbpc / 8.0;
-  printf("Average      - %6.3f bytes/cycle - %7.2f MiB/sec @ 3 ghz\n",sumbpc,(sumbpc * 3000000000.0 / 1048576.0));
+  printf("Average      - %6.3f bytes/cycle - %7.2f MiB/sec @ %u MHz\n",sumbpc,sumbpc*cpuMHz*MHz2MiBps,cpuMHz);
   fflush(NULL);
 }