Documentation for loop infrastructure

[Daniel Berlin]

Zdenek Dvorak wrote:
> Hello,
> 
> this patch adds documentation for loop analysis and representation of
> loops, as well as other loop-related analyses, and for functions to
> manipulate loops.  As I am not a native English speaker, there are
> probably many language errors in the document, so I would appreciate
> if someone could read it and fix them.
> 
> Also, the sections regarding data dependence analysis and lambda
> framework are missing.  Sebastian, Daniel, do you have time to write
> them?  If not, I can write something, but since they are your code,
> you probably have better understanding of them than I do.
> 

BTW, the docs are fine by me (if you need approval from someone who
maintains the area the docs are about. I forget), but i'd suggest you
get someone to look them over for spelling errors, etc.
I"ve only stared at the technical content.