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

[Michael Matz via cfe-commits]

Hi,

On Tue, 16 Feb 2016, H.J. Lu wrote:

> Here is the new definition:
> 
> An empty type is a type where it and all of its subobjects (recursively) 
> are of class, structure, union, or array type.  No memory slot nor 
> register should be used to pass or return an object of empty type.

The trivially copyable is gone again.  Why is it not necessary?


Ciao,
Michael.