[patch] HPEC Challenge Benchmark, Firbank enhancement

[Don McCoy]

This patch adds a new case to the Firbank benchmark for all platforms:  
fused fast convolution using a matrix of coefficients (support for which 
was recently added to the library).  This allows fast convolution on 
multiple inputs, using unique filters, all in a single, one-line expression.

Performance on the Cell/B.E. platform is much improved for this 
particular case.  Because the entire operation is seen by the compiler, 
a good deal of redundant data movement and code reloading on the SPEs is 
avoided.

Some minor cleanup of the other benchmarks is included.

Regards,

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

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