[RFC PATCH] implement asin() and acos() as built-in function

[Uros Bizjak]

Hello!

>We'd get more speedup if you could put the other opts into the .md
>file also.  (Hack hack, measure, measure) it becomes a 36.5%
>improvement judging by adding just inline asin and fmod to almabench.
>
>  
>
Attached to this message is RFC patch, which implements asin() and 
acos() as built-in function. Patch is tested, and produces code as 
expected, however, I would like someone to review this patch _before_ I 
implement long and float versions (they are trivial, once this RFC patch 
is OK'd). I will prepare full patch with ChangeLog tomorrow...

BTW: I'm really curious, if it will speed up almabench and how much...

    Uros.
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