[PATCH] Simple sqrt implementation for sphereflake

[Daniel Dunbar]

This seems reasonable, given the primary intent of these tests. The only
problem I see with this is that there is actually some value in testing the
compiler's handling of the real sqrt(), but that is something probably more
properly done by specific functional tests written by someone with a very
good idea of exactly what is allowed.

 - Daniel

http://reviews.llvm.org/D3667