[codegen 1.5] Make channel lowering respect placeholders #3632
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[codegen 1.5] Make channel lowering respect placeholders
Our node utility function ReplaceWithAnd previously unconditionally dropped all-ones literals - which caused some substantial errors in context of Codegen 1.5's use of literals as placeholders. We instead explicitly block this behavior, while still leaving the utility functions fully flexible for convenience.
While we're at it, we upgrade the utility functions to be able to combine arbitrary literals into a single literal when requested.