It's nice to have a quick way to get stable results on the local
machine for the classic d8 benchmarks. CSuite revitalizes an
old tool called BSuite which offers multiple averaged runs,
and a nice ascii display of results.

Sample usage:

./csuite.py octane baseline ~/src/v8/out/d8
./csuite.py octane compare ~/src/v8/out-mine/d8

                              benchmark:    score |   master |      % |
===================================================+==========+========+
                                Richards:  26201.0 |  26568.0 |   -1.4 |
                               DeltaBlue:  55744.0 |  58309.0 |   -4.4 |
                                  Crypto:  31831.0 |  31815.0 |        |
                                RayTrace:  73481.0 |  73185.0 |    0.4 |
              ............<snip>............................
                                  Octane:  36388.0 |  35741.0 |    1.8 |
---------------------------------------------------+----------+--------+


See README.md for more documentation.

Change-Id: I182490506ca07fab1240bd485bd1d7a8920db893
Reviewed-on: https://chromium-review.googlesource.com/c/1387487
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58434}