Generate all explicit and implicit impls based on one map #630
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This was referenced Mar 14, 2021
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As part of type checking we precompute an OrderedMap of all the explicit and implicit generic type instantiations that need to be emitted. This eliminates previous duplication of logic between the Rust code generator and C++ code generator (the diff is net -73) but more importantly this refactor will be necessary for #608 because it provides a place to attach information about generic lifetime parameters that go with each of these impls. The lifetime information will be added in a later PR.