[ADT] Refactor MapVector::insert, try_emplace, and operator[] (NFC) (#155205) The l-value and r-value reference variants of try_emplace contain nearly identical code. Also, operator[] makes its own call to Map.try_emplace. This patch introduces a templated helper function, try_emplace_impl, and uses it in all of MapVector::insert, try_emplace, and operator[]. The helper function uses perfect forwarding to preserve the exact key type. This patch moves the "private:" section to the end of the class so that the new helper function can use iterator.
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