[RFC] Eliminate NESTED_ATTR_FUNC

[Paolo Bonzini]

>> #include<stdio.h>
>>
>> void foo (int a, int b, void (*hook) (int aa, int bb, int cc))
>> {
>>   b += a;
>>   hook (a, b, a + b);
>> }
>>
>> void qq (int a)
>> {
>>   auto void q1 (int aa, int bb, int cc);
>>   void q1 (int aa, int bb, int cc)
>>     {
>>       printf ("%d %d %d\n", a, aa + bb, cc);
>>     }
>>
>>   foo (a, a + 1, q1);
>> }
>>
>> int main()
>> {
>>   qq (10);
>> }
>>
>> Compile with:
>> gcc -m32 -mregparm=3 -Os test.c
>>
>> ./a.out
>> 10 31 -6674368

Ok, this was the only important part of the message to us GCC hackers. :-)

Can you please report a bug in bugzilla, saying which versions work and 
which fail?  Also can you write in the report what was your analysis 
with respect to regparm?

Thanks!

Paolo