Rust protobuf: remove the need for a generated placement_new thunk
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Rust protobuf: remove the need for a generated
placement_newthunkWe have been relying on a per-message generated
placement_newfunction forimplementing map insertion, but this CL simplifies things by removing that.
Instead, we do a reflective swap if possible, or else fall back on a copy.
This will probably make insertions a bit slower, but I think it may be worth it
because it should make it much simpler to have a blanket implementation for
ProxedInMapValue that works for all map types.
It looks like it should be possible to make this faster in the future by
implementing a bitwise move that will work for any message.