remove spurious factor argument

Author: tlively

src/tools/wasm-reduce/destructive-reducer.h

@@ -31,7 +31,7 @@ struct DestructiveReducer
   Expression* beforeReduction = nullptr;
   Index funcsSeen = 0;
 
-  DestructiveReducer(Reducer& reducer, int factor)
+  DestructiveReducer(Reducer& reducer)
     : reducer(reducer), factor(reducer.factor) {}
 
   void noteReduction(size_t amount = 1);

src/tools/wasm-reduce/reducer.cpp

@@ -266,7 +266,7 @@ size_t Reducer::reduceDestructively(int factor) {
               << result << '\n';
   }
   // destroy!
-  DestructiveReducer destructiveReducer(*this, factor);
+  DestructiveReducer destructiveReducer(*this);
   destructiveReducer.walkModule(&wasm);
   return destructiveReducer.reduced;
 }