Fix classical conditions getting optimized ahead of their measurements #6872
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During simulation, classical controlled empty subcircuits were getting put in the "prefix" part of the simulation, while corresponding measurements were put in the suffix, causing these ops to be executed out of order. This was due to the
split_into_matching_protocol_then_generalfunction, which ensured that qubit access order was preserved, but overlooked doing the same for measurement keys. This PR fixes that.Fixes #6730