[OpenACC] Supporting Device Specific Clauses

[Sebastian Galindo]

Hi Thomas,

Thanks for your response.

> These will have to exist until the offload code gets split off, and   
> only then (in the subsequent host as well as device code generation)  
> we'll be able to discard all "chains of clauses" that are not         
> applicable to the respective compilation target.                      

It seems interesting, thanks for the detail.

> There is a old WIP patch for 'device_type' clause handling...

Oh, I'll look into that to see the proposed implementation, just to get 
an idea and later start helping with it (not necessarily within the     
GSoC project).                                                          

Again, thanks for your details and your time!

Best, Sebastian