Increase threshold

tools/profiling/microbenchmarks/bm_diff.py

@@ -174,7 +174,7 @@ class Benchmark:
       mdn_diff = abs(median(new) - median(old))
       print '%s: new=%r old=%r mdn_diff=%r' % (f, new, old, mdn_diff)
       s = speedup.speedup(new, old)
-      if s and mdn_diff > 0.5:
+      if s and mdn_diff > 0.5 and abs(s) >= 10:
         self.final[f] = '%+d%%' % s
     return self.final.keys()