[PATCH] Fix small structure passing on x86-64

[Uros Bizjak]

Hello!

> the structure
>
> struct S { char c; char arr[4]; float f; };
>
> is incorrect passed on x86-64/Linux with every C compiler I tried: only the 
> first 4 bytes and the float are passed (in registers), the 5th byte is lost.
> That's because the first word has partial integer class X86_64_INTEGERSI_CLASS 
> instead of full integer class X86_64_INTEGER_CLASS.
>
> Tested on x86_64-suse-linux and compat-regtested against the system compiler, 
> OK for mainline?
>
>
> 2008-10-31  Eric Botcazou  <ebotcazou@adacore.com>
>
> 	* config/i386/i386.c (classify_argument) <ARRAY_TYPE>: Promote partial
> 	integer class to full integer class if the offset is not word-aligned.
>
>
> 2008-10-31  Eric Botcazou  <ebotcazou@adacore.com>
>
> 	* gcc.c-torture/execute/20081031.c: New test.
>   

This is OK for mainline and all release branches after a couple of days 
in mainline without problems.

Thanks,
Uros.