RFC: Update Intel386, x86-64 and IA MCU psABIs for passing/returning empty struct

[Matthijs van Duin via cfe-commits]

On 11 February 2016 at 16:31, H.J. Lu <hjl.tools at gmail.com> wrote:
> struct A {
> static void foo (void) ();
> static int xxx;
> };

What about it? It's an empty struct.  (And it declares a function and
a variable in the namespace of A, which however do not have any
relevant impact here.)

Matthijs van Duin