[PATCH] Simple sqrt implementation for sphereflake

[Renato Golin]

Hi Daniel,

I agree. I did some functional testing (around nan, inf, and representative values), but that was far from complete or accurate.

Also, this is a task for gcc/glibc guys, since it was a specific version of Linaro GCC that broke and not the next. 

But I was meaning to do that anyway, to de-couple GCC bugs with the test-suite.

Thanks!
--renato

http://reviews.llvm.org/D3667