remove default destructors & some default constructors

Another ~700 KB reduction in binary size

src/ast/ast_pp_dot.cpp

@@ -45,8 +45,6 @@ struct ast_pp_dot_st {
         m_printed(),
         m_to_print(),
         m_first(true) {}
-
-    ~ast_pp_dot_st() {};
     
     void push_term(const expr * a) { m_to_print.push_back(a); }        
 

src/ast/euf/euf_ac_plugin.h

@@ -47,7 +47,6 @@ namespace euf {
             unsigned_vector eqs;       // equality occurrences
             
             unsigned root_id() const { return root->n->get_id(); }
-            ~node() {}
             static node* mk(region& r, enode* n);
         };
 
@@ -270,8 +269,6 @@ namespace euf {
         ac_plugin(egraph& g, unsigned fid, unsigned op);
 
         ac_plugin(egraph& g, func_decl* f);
-
-        ~ac_plugin() override {}
         
         theory_id get_id() const override { return m_fid; }
 

src/ast/euf/euf_arith_plugin.h

@@ -33,8 +33,6 @@ namespace euf {
     public:
         arith_plugin(egraph& g);
 
-        ~arith_plugin() override {}
-
         theory_id get_id() const override { return a.get_family_id(); }
 
         void register_node(enode* n) override;

src/ast/euf/euf_bv_plugin.h

@@ -95,8 +95,6 @@ namespace euf {
     public:
         bv_plugin(egraph& g);
 
-        ~bv_plugin() override {}
-
         theory_id get_id() const override { return bv.get_family_id(); }
 
         void register_node(enode* n) override;

src/ast/euf/euf_specrel_plugin.h

@@ -34,8 +34,6 @@ namespace euf {
     public:
 
         specrel_plugin(egraph& g);
-
-        ~specrel_plugin() override {}
         
         theory_id get_id() const override { return sp.get_family_id(); }
 

src/ast/rewriter/label_rewriter.cpp

@@ -26,8 +26,6 @@ label_rewriter::label_rewriter(ast_manager & m) :
     m_label_fid(m.get_label_family_id()),
     m_rwr(m, false, *this) {}
 
-label_rewriter::~label_rewriter() {}
-
 br_status label_rewriter::reduce_app(
     func_decl * f, unsigned num, expr * const * args, expr_ref & result, 
     proof_ref & result_pr) {

src/ast/rewriter/label_rewriter.h

@@ -27,7 +27,6 @@ class label_rewriter : public default_rewriter_cfg {
     rewriter_tpl<label_rewriter> m_rwr;
 public:    
     label_rewriter(ast_manager & m);
-    ~label_rewriter();
 
     br_status reduce_app(func_decl * f, unsigned num, expr * const * args, expr_ref & result, 
                          proof_ref & result_pr);

src/ast/rewriter/rewriter.h

@@ -346,8 +346,6 @@ public:
     ast_manager & m() const { return this->m_manager; }
     Config & cfg() { return m_cfg; }
     Config const & cfg() const { return m_cfg; }
-
-    ~rewriter_tpl() override {};
     
     void reset();
     void cleanup();

src/ast/simplifiers/reduce_args_simplifier.cpp

@@ -375,8 +375,6 @@ public:
         m_bv(m)
     {}
 
-    ~reduce_args_simplifier() override {}
-
     char const* name() const override { return "reduce-args"; }
 
     void collect_statistics(statistics& st) const override {