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

[Stephen Lin]

On Thu, Apr 18, 2013 at 11:23 PM, Evan Cheng <evan.cheng at apple.com> wrote:
> Thanks. One suggestion. Next time please separate out stylistic changes into a separate patch.
>
> Evan
>
> Sent from my iPad

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
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