Remove dead code and some unused parameters

Found with CLion inspections

src/V3CUse.cpp

@@ -218,7 +218,7 @@ public:
 //######################################################################
 // Class class functions
 
-void V3CUse::cUseAll(AstNetlist* nodep) {
+void V3CUse::cUseAll() {
     UINFO(2, __FUNCTION__ << ": " << endl);
     // Call visitor separately for each module, so visitor state is cleared
     for (AstNodeModule* modp = v3Global.rootp()->modulesp(); modp;