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

[FX Coudert]

Thanks to Andrew's code, Mike's and Geoff's comments in the PR, help  
from Uros, Paolo and Jack, and Dominique's machine for testing, here  
is a patch for fixing this PR. It has three independent parts, joined  
together because I regtested them together:

   1. the target part, in gcc/config/darwin* and gcc/config/rs6000,  
that takes care of setting correct assembler names for the builtins,  
if needed
   2. the Fortran front-end part, bordering on obvious, that makes  
cpow{f,,l} builtins instead of simply considering them library  
functions (otherwise, they don't benefit from the patch above)
   3. the Fortran testsuite part, splitting testing of ERF/ERFC from  
large_real_kind_2.F90 into its separate test case, which still fails  
on Darwin at -O0 because Apple's PowerPC erfl() and ercl() are plain  
useless.

The patch was bootstrapped on powerpc-apple-darwin9.2.0 with C and  
Fortran, and regtested with both -m32 and -m64 for these same  
languages. OK for trunk? (I need a Darwin maintainer approval for the  
target stuff, and a Fortran maintainer for Fortran parts.)

FX

-- 
François-Xavier Coudert
http://www.homepages.ucl.ac.uk/~uccafco/

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