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perf: es5 markChangesRecursively

This patch only applies to `produce` calls that have a patch listener.

- Removed the `diffKeys` function, which created 2 avoidable arrays.
  Now, the keys are diffed and processed in one pass.

- For objects, the last loop over `proxy` has been removed.

- Added fast paths for pre-existing keys when looking for added/removed
  object keys.

- Avoid passing removed array values to `markChangesRecursively`.

- Unwrap `state.assigned` as a local variable for fast access.

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