[PATCH]: PR29335 use MPFR for two-argument math builtins (pow, atan2, hypot)

[Roger Sayle]

On Sun, 29 Oct 2006, Kaveh R. GHAZI wrote:
> 2006-10-29  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
>
> 	* builtins.c (fold_builtin_hypot): Rearrange recursive
> 	transformation before others, and also do ABS_EXPR.  When
> 	necessary, check flag_unsafe_math_optimizations.  When necessary,
> 	add fabs.
>
> testsuite:
> 	* gcc.dg/builtins-20.c: Add more hypot tests.

Cool!  This is OK for mainline.  Thanks.

Roger
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