chore: make internal simplification function private

Author: Snowy1803

include/Sema/ConstraintSystem.hpp

@@ -443,6 +443,7 @@ class ConstraintSystem {
     /// @brief Print all constraints in a ConstraintSystem for debugging.
     void print();
 
+private:
     // Constraint simplification passes
     void reorderConstraintsByPriority();
 };