[patch] Multiply-add user-defined kernel

[Don McCoy]

This kernel extends the user-defined kernel framework to allow functions
having three inputs and one output.  Multiply-add is used as a test case
for this.  At this time, only scalar floats and complex-interleaved
floats are supported.

A few other minor corrections are included with this patch.

Ok to commit?

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

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