More reducer improvements (#1533)

*    Add a helper class to iterate over all a node's children, and use that when attempting to replace a node with its children.
*    If a child has a different type than the parent, try to replace the parent with a conversion + the child (for example, a call may receive two f32 inputs and return an i32; we can try to replace the call with one of those f32s and a conversion to an i32).
*    When possible, try to replace the function body with a child even if the child has a different type, by changing the function return value.

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