[turbofan] Support for combining branches with <Operation>WithOverflow.

src/compiler/machine-node-factory.h

Index: src/compiler/machine-node-factory.h
diff --git a/src/compiler/machine-node-factory.h b/src/compiler/machine-node-factory.h
index 984d3944f9c3df7bcf2bcce4de33e4e872a1e115..8e11815aaea43759ec7e03d5fe5e062e94170625 100644
--- a/src/compiler/machine-node-factory.h
+++ b/src/compiler/machine-node-factory.h
@@ -199,20 +199,14 @@ class MachineNodeFactory {
   Node* Int32Add(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Int32Add(), a, b);
   }
-  void Int32AddWithOverflow(Node* a, Node* b, Node** val_return,
-                            Node** ovf_return) {
-    Node* add = NEW_NODE_2(MACHINE()->Int32AddWithOverflow(), a, b);
-    if (val_return) *val_return = Projection(0, add);
-    if (ovf_return) *ovf_return = Projection(1, add);
+  Node* Int32AddWithOverflow(Node* a, Node* b) {
+    return NEW_NODE_2(MACHINE()->Int32AddWithOverflow(), a, b);
   }
   Node* Int32Sub(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Int32Sub(), a, b);
   }
-  void Int32SubWithOverflow(Node* a, Node* b, Node** val_return,
-                            Node** ovf_return) {
-    Node* add = NEW_NODE_2(MACHINE()->Int32SubWithOverflow(), a, b);
-    if (val_return) *val_return = Projection(0, add);
-    if (ovf_return) *ovf_return = Projection(1, add);
+  Node* Int32SubWithOverflow(Node* a, Node* b) {
+    return NEW_NODE_2(MACHINE()->Int32SubWithOverflow(), a, b);
   }
   Node* Int32Mul(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Int32Mul(), a, b);