[PATCH] Fix use-after-kill in TailDuplication

[Pete Cooper]

I think you're right that my patch fixed it, but yours is useful too.

I haven't looked too closely, but if you really are able to avoid adding entries to the Copies vector, then you are potentially reducing the work this pass does and speeding it up.  You might even avoid creating useless copy instructions that DCE would later remove.  So i'd try land this change too if you can.

Cheers,
Pete


http://reviews.llvm.org/D6263

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