Brain dump on type merging

[Chandler Carruth]

On Thu, Dec 4, 2014 at 1:18 AM, Hal Finkel <hfinkel at anl.gov> wrote:

> +1 -- We don't need types on pointers -- they don't convey any information
> to the optimizer. FWIW, it would not surprise me if the elimination of all
> of the unnecessary pointer bitcasts produces measurable compile-time
> savings.


Indeed.

I'm actually interested in looking at this if no one else gets to it first.
(for me, it's after the pass manager at the least) If someone else is able
to hack on this though, it would be awesome. I think it'll actually help
LTO quite a lot by reducing the footprint of the IR.
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