add special relations tactic

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/ast/rewriter/CMakeLists.txt

@@ -19,6 +19,7 @@ z3_add_component(rewriter
     factor_equivs.cpp
     factor_rewriter.cpp
     fpa_rewriter.cpp
+    func_decl_replace.cpp
     hoist_rewriter.cpp
     inj_axiom.cpp
     label_rewriter.cpp

src/ast/rewriter/func_decl_replace.cpp

@@ -86,7 +86,7 @@ expr_ref func_decl_replace::operator()(expr* e) {
             }
         }        
     }
-    return expr_ref(cache.find(e), m);
+    return expr_ref(m_cache.find(e), m);
 }
 
 void func_decl_replace::reset() {