[PATCH] Allow CodeGen to take advantage of functions that always return arguments

[Stephen Lin]

> OK, I removed some extraneous changes and updated the patch to be
> based against a mostly non-recursive implementation of sameNoopInput:
>
>     http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130415/172039.html
>
> I've also added the restriction that 'returned' can only be on one
> parameter to allow sameNoopInput to see through 'returned' without
> recursion or extra bookkeeping. There's a minor tack-on bug fix;
> apparently the verifier check that 'nest' is only on one parameter was
> never working correctly...I'm willing to split that off to a separate
> patch if that's preferable though.
>
> The other patch listed is my original e-mail has been committed so is
> no longer an uncommitted dependency.
>
> Stephen

I fixed a small issue (an extraneous recursive call) and rebased against:

     http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130415/172067.html

(although the patch should merge cleanly against the previous version, too.)

Stephen
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