Fix fixed lookup that contains constants #2371
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This is something I came across in #2361: The
FixedLookupMachinedoes not recognize lookups of the form[...] in [col1, col2, 3, col4]. The reason that this was not an issue before is that the PIL optimizer simplifies such lookups. But it does not if they are represented as bus interactions.With this PR, the
FixedLookupMachinelooks for either fixed columns or compile-time constants on the RHS.