optimize: more robust statement merge with vmap

Check expressions that are expected on the rhs rather than using a
catch-all default case.

Actually, lists and sets need to be their own routine, because this
needs the set element key expression to be merged.

This is a follow up to 99eb46969f3d ("optimize: fix vmap with anonymous
sets").

Fixes: 1542082e259b ("optimize: merge same selector with different verdict into verdict map")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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