[Primitives] Add default=None for list_lookup #1154
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Rather than use an explicit default value as the standard pattern, it makes more sense to use the final element of the list since we're buildling a mux tree anyways. The existing explicit "default" value pattern might still be useful to emulate a certain "else" pattern that's different than the last element.
In adding this, I noticed the mux tree was being built forwards, which made the generated code a bit convoluted for this default case, so I reversed the tree instead to make it look more natural in the generated code.