Update lib/Dialect/HW/Transforms/HWVectorization.cpp

Co-authored-by: Hideto Ueno <uenoku.tokotoko@gmail.com>

Author: mafeguimaraes

lib/Dialect/HW/Transforms/HWVectorization.cpp

@@ -226,10 +226,8 @@ class Vectorizer {
   /// Recursively traverses the defining operations of a value to build a
   /// set of all values in its transitive logic cone.
   void collectLogicCone(mlir::Value val, llvm::DenseSet<mlir::Value> &cone) {
-    if (cone.count(val)) {
+    if (!cone.count(val).second)
       return;
-    }
-    cone.insert(val);
 
     Operation *definingOp = val.getDefiningOp();
     // Stop traversal at block arguments, constants, or when the source is gone.