Seed SpecConstr from local calls
Seed SpecConstr based on *local* calls as well as *RHS* calls. See Note [Seeding top-level recursive groups]. The change here is mentioned here: NB: before Apr 15 we used (a) only, but Dimitrios had an example where (b) was crucial, so I added that. This is a pretty small change, requested by Dimitrios, that adds SpecConstr call patterns from the rest of the module, as well as ones from the RHS. Still to come: #10346.
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