[PATCH] Don't modify the DenseMap being iterated over from within the loop

[Chandler Carruth]

On Thu, Feb 26, 2015 at 5:03 PM, Sanjoy Das <sanjoy at playingwithpointers.com>
wrote:

> Hi reames, artagnon,
>
> Inserting elements into a `DenseMap` invalidated iterators pointing into
> the `DenseMap` instance.
>

This is obvious, please commit.

If you have a test case that happens to tickle this, always nice to add.
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