add --benchmark and --exclude option to the benchmark scripts for debugging

[hirooih]

This PR adds --benchmark and --exclude option to build_all.py, benchmark_size.py, and benchmark_speed.py.
For example --benchmark md5sum tarfind option builds or measures only md5sum and tarfind tests.
--exclude md5sum tarfind option builds or measures all tests except for md5sum and tarfind.

This was quite useful for debugging.

[jeremybennett]

This is an interesting approach, since I know from practical work that often you use a subset of Embench in practical projects. We need to be clear that any result with a subset is not a valid Embench score, but it can still be very useful. I've asked @PaoloS02 to review your patch.

[hirooih]

We need to be clear that any result with a subset is not a valid Embench score,

I agree with you.
We added new tests after 1.0 release. We can also use --exclude option to compare a result with results for 1.0 release.

I've asked @PaoloS02 to review your patch.

Thank you.

[PaoloS02]

Thanks for this @hirooih ,
I took the liberty to add a commit on your branch with warning messages that clarify that subsets of the benchsuite don't generate valid results. If it is phrased satisfactorily @jeremybennett I think this patch can be merged. I tested it and it works well.
Btw I quite agree this options are useful. I've been moving tests to temporary folders lately to focus on debugging a subset.

[jeremybennett]

Thanks for this @hirooih , I took the liberty to add a commit on your branch with warning messages that clarify that subsets of the benchsuite don't generate valid results. If it is phrased satisfactorily @jeremybennett I think this patch can be merged. I tested it and it works well. Btw I quite agree this options are useful. I've been moving tests to temporary folders lately to focus on debugging a subset.

If @hirooih is happy with your change, then so am I.

[hirooih]

It looks good to me.
Thanks!

[hirooih]

I've added the commit proposed by @PaoloS02 and fixed conflicts which was caused after the original commit.