cortex-strings benchmarks

[Michael Hope]

Hi Dave.  I had a little play with cortex-strings and did some
benchmarks on my Tegra 2.  Images are attached.

I've added two scripts to cortex-strings:
  scripts/bench-all.sh runs all the routines on all variants and records them
  scripts/plot.py plots the results from above

ploy.py corrects for the benchmark overhead by doing a linear fit to
the null 'bounce' results and subtracting this fit.

You should be able to a autogen; configure; make; bash
scripts/bench-all.sh | tee log.txt; python scripts/plot.py log.txt.
I'm sure you have your own favourite tools though.

The string routines look good.  Lumpy in funny ways though...

-- Michael
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