[PATCH] DataFlowSanitizer: Make unreachable BBs verify under the args ABI.

[Chandler Carruth]

On Wed, Aug 7, 2013 at 5:26 PM, Peter Collingbourne <peter at pcc.me.uk> wrote:

> +    // Unused basic blocks will not be instrumented.  This is okay,
> because
> +    // they are unreachable.  But we need to modify any return
> instructions in
> +    // these BBs to return a value of the correct type in order to pass
> the
> +    // verifier.  This is easier than just deleting them because they may
> be
> +    // referenced by phi nodes (and each other).
>

There is a utility that will just delete all unreachable code. Call that
first?
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