[PATCH] CodeGen: Emit sqrt intrinsic from __builtin_sqrt

[Tom Stellard]

In http://reviews.llvm.org/D8468#143776, @hfinkel wrote:

> To play devil's advocate: I don't understand what you're trying to fix here. So the intrinsic has undefined behavior if x < -0.0; that's the definition of our intrinsic.


The check is there to avoid the undefined behavior.  My understanding is that __builtin_sqrtf is supposed to return NaN for x < -0.0, so we need to handle that case specially if we emit the intrinsic.

> Regardless, you don't need to insert the extra code if we're in NoNaNs mode.





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