Add standalone resymbolization pass #962
Merged
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This PR adds a resymbolization pass by breaking out code previously defined in
stdlib/mexpr/monomorphize.mcinto a new filestdlib/mexpr/resymbolize.mc. The new file contains a compositional implementation, where each expression, declaration, type, and pattern is implemented in a separate language fragment. This allows us to reuse parts of the resymbolization for individual models in CorePPL (where we do not want to resymbolize types).