--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> ---
On Sun, 8 Apr 2018, hubicka at gcc dot wrote:

> --- Comment #6 from Jan Hubicka <hubicka at gcc dot> ---
> The problem is that we build type inheritance graph earlier and at that time
> there are still virtual functions in the callgraph that are optimized out
> before free-lang-data.  Their types however remain in ODR hash and thus are
> considered by devirtualization.  I guess easiest fix is to simply rebuild ODR
> hash.  We could also walk it and free lang data on them, but I think that 
> would
> be just wasted effort.

Note the testcase shows we perform devirtualization after free-lang-data
using the "stale" data.

So walking the ODR hash looks like the simplest fix here?

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