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Lean.Compiler.IR.ElimDeadBranches

In truncate, we approximate a value as top if depth > truncateMaxDepth. TODO: add option to control this parameter.

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    Make sure constructors of recursive inductive datatypes can only occur once in each path. Values at depth > truncateMaxDepth are also approximated at top. We use this function this function to implement a simple widening operation for our abstract interpreter. Recall the widening functions is used to ensure termination in abstract interpreters.

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      Widening operator that guarantees termination in our abstract interpreter.

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                    Return true if the assignment of at least one parameter has been updated.

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