[PATCH] Store intrinsic ID by value in Function instead of a string lookup. NFC

[Pete Cooper]

> On May 18, 2015, at 5:05 PM, Reid Kleckner <rnk at google.com> wrote:
> 
> You are a hero for doing this. :) I was looking at this the other day and thinking "really, a DenseMap to look up a 32-bit integer?”
Thanks :)  It was pretty scary looking code for something we call so frequently.

BTW, the commits ended up being r237641 and r237642.

Cheers,
Pete
> 
> http://reviews.llvm.org/D9836
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