This commit marks the type converter in `populate...` functions as `const`. This is useful for debugging. Patterns already take a `const` type converter. However, some `populate...` functions do not only add new patterns, but also add additional type conversion rules. That makes it difficult to find the place where a type conversion was added in the code base. With this change, all `populate...` functions that only populate pattern now have a `const` type converter. Programmers can then conclude from the function signature that these functions do not register any new type conversion rules. Also some minor cleanups around the 1:N dialect conversion infrastructure, which did not always pass the type converter as a `const` object internally.
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