[LLVMdev] Optimization of sqrt() with invalid argument

[Tim Northover]

> This is important in practice because of the xalanc benchmark in SPEC
> CPU2006.

No, it would be important in practice for really used legacy (i.e.
unfixable) code relying on this undefined behaviour. It's important
for gaming the system if it occurs in SPEC.

Cheers.

Tim.