Better tied weight handling #464
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Handle cases where some input models have a tied tensor and some don't.
For example, there are some fine tunes of Llama 3.2 3B floating around that are ~3.6B parameters because they have a separate LM head - with these changes these can be merged with standard sized ones. There will be a LM head in the output model if any inputs have one. Otherwise behavior will be as it was before.