Iterate properly

tools/profiling/microbenchmarks/bm_diff.py

@@ -147,7 +147,7 @@ finally:
   subprocess.check_call(['git', 'checkout', where_am_i])
   subprocess.check_call(['git', 'submodule', 'update'])
 
-for loop in args.loops:
+for loop in range(0, args.loops):
   jobs.extend(x for x in itertools.chain(
     (collect1(bm, 'opt', 'new', loop) for bm in args.benchmarks),
     (collect1(bm, 'counters', 'new', loop) for bm in args.benchmarks),