[PATCH] Verify 'optnone' can run DAG combiner when appropriate

[Paul Robinson]

In http://reviews.llvm.org/D8614#149007, @echristo wrote:

> Looks good. FWIW this is what should have been in the revert patch commit message as well :)
>
> -eric


FWIW my thinking was "undo the obvious mistake."  Just not as obvious as I thought, I guess!


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