Translate types that were declared inside functions as opaque types.

This fixes a panic with the following header:

    template<typename T>
    struct Foo {};
    template<typename T>
    Foo<T> foo{};

    void f() {
      struct Bar {
        Bar() {}
      };
      foo<Bar>;
    }

Because we don't parse the insides of function bodies, code like this could
cause us to parse a type (here, `Bar`) that we didn't see in our initial pass,
which can cause subtle problems.

Closes #2036.

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