patch [ppc] Complex values are returned differently depending on -mcpu=G5

[Fariborz Jahanian]

Complex values are returned differently depending on -mcpu=G5 (or - 
mpowerpc64).

Test case is: gcc.c-torture/execute/960512-1.c

__complex__
double f ()

In 32-bit mode, the complex value is returned in r3:r4,r5:r6.  In - 
mcpu=G5
mixed mode, the value is returned in r3,r4.  ABI breakage.

Attached patch, dejagnu tested in apple-ppc-darwin's branch (in - 
mcpu=G5 mode) fixes this problem.

OK for FSF mainline?

- fariborz


ChangeLog:

2005-09-23  Fariborz Jahanian <fjahanian@apple.com>

         * config/rs6000/rs6000.c (rs6000_function_value): Parallel  
pattern
         for __complex__ double in -mcpu=G5 mode.

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