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 13:58, H.J. Lu <hjl.tools at gmail.com> wrote:
> "POD for the purpose of layout" is defined in the Itanium C++ ABI here:
>
> http://mentorembedded.github.io/cxx-abi/abi.html#definitions

Sorry, I overlooked that.

I still stand by my viewpoint however that triviality of copying and
destruction is the appropriate criterion here rather than this obscure
constraint on layout.

Matthijs van Duin