basic asm and memory clobbers - Proposed solution

[Paul_Koning@Dell.com]

> On Nov 28, 2015, at 2:02 AM, Bernd Edlinger <bernd.edlinger@hotmail.de> wrote:
> 
> ...
> Well, I start to think that Jeff is right, and we should treat a asm ("") as if it
> were asm volatile ("" ::: ) but if the asm ("nonempty with optional %") we should
> treat it as asm volatile ("nonempty with optional %%" ::: "memory").

I agree.  Even if that goes beyond the letter of what the manual has promised before, it is the cautious answer, and it matches expectations of a lot of existing code.

	paul