[patch] Benchmark enhancement - 'latency' metric

[Don McCoy]

This patch allows us to do a straight comparison of one routine's 
execution time to another's, rather than just looking at the number of 
fp operations per second.  This makes sense to do when comparing say, 
the efficiency of different algorithms such as an FIR done with FFT's vs 
the brute-force method used by the Fir class (each has a different 
number of FLOPS used per point).

Note that the units are in *micro*seconds per point.

Regards,

-- 
Don McCoy
don (at) CodeSourcery
(888) 776-0262 / (650) 331-3385, x712
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