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run resolves types of polymorphic builtin functions. This assumes there are no assignments to builtin functions, i.e. doesntHaveAssignmentToBuiltin.

For example, the max of max(xs) has a type \(\mathbf{list}(\alpha) \to \alpha\) but the max of max(x, y, z) has a type \(\alpha \times \alpha \times \alpha \to \alpha\). So this function converts Var "max" to BuiltinMax1 t, BuiltinMax t 2, BuiltinMax t 3, etc..