[patch] CML backend fir FIR filters

[Don McCoy]

This patch adds support for real, single-precision, floating point FIR
filters using CML. 

There is some overlap with another patch of mine (06/07: [patch] Fix for
Fir destructor not getting called) as well as one of Stefan's (06/09:
patch: Fix various FIR backends to support negative strides), but it's
minimal as most of my changes are in the file opt/cbe/cml/fir.hpp.  I
will merge before committing, once those patches are in.

Ok to commit?

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

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