Re: Remove vtable_method field in cgraph_node

[Jan Hubicka <hubicka at ucw dot cz>]

> > notice that OBJ_TYPE_REF is useless since foo got devitualized and it holds alive
> > the useless s._vptr.S = &_ZTV1S[2].  We want to drop OBJ_TYPE_REF at time we fold
> > first argument to constant.
> 
> At some point we dropped all OBJ_TYPE_REF with direct fn but that lead to
> issues.  I'll try to dig up what that was.

Hah, that sounds really scary, given that OBJ_TYPE_REF should be semantically no-op.
We definitely drop them in tree-ssa-ccp, so if we need to preserve them somehow, that is
probably case where we should.

Honza