[PATCH]: Mark builtin erf as an "odd" function

[Roger Sayle]

On Fri, 10 Nov 2006, Kaveh R. GHAZI wrote:
> 2006-11-09  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
>
> 	* fold-const.c (negate_mathfn_p): Add BUILT_IN_ERF.
>
> 	* gcc.dg/torture/builtin-symmetric-1.c: New test.

This looks reasonable.  Ok for mainline.  Thanks.

Roger
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