[patch,target] Fix ppc-darwin issue with long double intrinsics (PR25477)

[Uros Bizjak]

Hello!

> > > +      /*darwin_patch_builtin (BUILT_IN_NANL);*/ /* Broken for now since it
> > > +        is defined as DEF_GCC_BUILTIN when it is also a C99 function.  */
>
> Note that this (builtin nan*) is bug 19984, which explains the history 
> behind the use of DEF_GCC_BUILTIN.
>   

Will attached patch fix this problem?

2008-02-24  Uros Bizjak  <ubizjak@gmail.com>

        PR middle-end/19984
        * builtins.def (BUILT_IN_NAN): Define as c99 builtin
        using DEF_C99_BUILTIN.
        (BUILT_IN_NANF): Ditto.
        (BUILT_IN_NANL): Ditto.

Bootstrapped on x86_64-linux-gnu, regression test is in progress.

Uros.
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