[patch]: Fix some corner cases in get_callee_fn and aggregate_value_p

[Kai Tietz <Kai dot Tietz at onevision dot com>]

Hi,

while reviewing the call abi patch for x86_64, I found the following 
issues. Maybe they are of some relevants as I noticed they are happening.
The patch in get_callee_fn for allowing  check for addr being a 
FUNCTION_DECL seems to be of not much relevant here, but at least there is 
a check in front checking for
a readonly function pointer, which verifies that TREE_CODE(addr) isn't 
already a FUNCTION_DECL.

ChangeLog

2008-11-26  Kai Tietz  <kai.tietz@onevision.com>

        * tree.c (get_callee_fn): Allow that CALL_EXPR points directly to 
a FUNCTION_DECL.
        * function.c (aggregate_value_p): For call expression take 
function type itself, if there
        is no declaration available.

Is this patch ok for apply?

Cheers,
Kai



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