[patch] Benchmark enhancements - linear sweep option

[Don McCoy]

This patch, along with existing -start and -stop options, increases our 
ability to select ranges of interest when sweeping the benchmark size.

The -linear SCALE option will take the starting value and multiply it by 
SCALE (instead of using a power of two).  The -center option can shift 
this range of values to highlight a specific region of interest.

Regards,

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