[PATCH] Add a note to LangRef about static allocas.

[Matt Arsenault]

On 07/01/2014 05:31 PM, Reid Kleckner wrote:
> Sounds good to me, go for it.  I'd wordsmith it a bit.  I don't think 
> "is basically free" is important.  The important thing is that the 
> stack adjustment is folded into the function prologue.
Both of these are very target specific details that don't really have 
anything to do with the IR instruction's semantics