Remove empty leaf destructors. (#6211)

src/qe/nlarith_util.cpp

@@ -1616,7 +1616,6 @@ namespace nlarith {
         public:
             simple_branch(ast_manager& m, app* cnstr):
               m_cnstr(cnstr, m), m_atoms(m) {}
-            ~simple_branch() override {}
             app* get_constraint() override { return m_cnstr.get(); }
             void get_updates(ptr_vector<app>& atoms, svector<util::atom_update>& updates) override {
                 for (unsigned i = 0; i < m_atoms.size(); ++i) {
@@ -1636,7 +1635,6 @@ namespace nlarith {
         public:
             ins_rem_branch(ast_manager& m, app* a, app* r, app* cnstr):
               simple_branch(m, cnstr) { insert(a); remove(r); }             
-            ~ins_rem_branch() override {}
         };
 
         /**

src/qe/nlqsat.cpp

@@ -835,9 +835,6 @@ namespace qe {
             m_nftactic = mk_tseitin_cnf_tactic(m);
         }
 
-        ~nlqsat() override {
-        }
-
         char const* name() const override { return "nlqsat"; }
 
         void updt_params(params_ref const & p) override {

src/qe/qe_array_plugin.cpp

@@ -27,9 +27,6 @@ namespace qe {
         {
         }
 
-        ~array_plugin() override {}
-
-        
         void assign(contains_app& x, expr* fml, rational const& vl) override {
             UNREACHABLE();
         }

src/qe/qe_cmd.cpp

@@ -26,9 +26,6 @@ public:
         p.insert("print_statistics", CPK_BOOL, "(default: false) print statistics.");
     }
     
-    ~qe_cmd() override {
-    }
-    
     void prepare(cmd_context & ctx) override {
         parametric_cmd::prepare(ctx);
         m_target   = nullptr;

src/qe/qe_mbi.h

@@ -106,7 +106,6 @@ namespace qe {
         solver_ref m_solver;
     public:
         prop_mbi_plugin(solver* s);
-        ~prop_mbi_plugin() override {}
         mbi_result operator()(expr_ref_vector& lits, model_ref& mdl) override;
         void block(expr_ref_vector const& lits) override;
     };
@@ -134,7 +133,6 @@ namespace qe {
                          expr_ref_vector& uflits);
     public:
         uflia_mbi(solver* s, solver* emptySolver);
-        ~uflia_mbi() override {}
         mbi_result operator()(expr_ref_vector& lits, model_ref& mdl) override;
         void project(model_ref& mdl, expr_ref_vector& lits);
         void block(expr_ref_vector const& lits) override;