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

src/compiler/machine-node-factory.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_MACHINE_NODE_FACTORY_H_
 #define V8_COMPILER_MACHINE_NODE_FACTORY_H_
 
 #ifdef USE_SIMULATOR
 #define MACHINE_ASSEMBLER_SUPPORTS_CALL_C 0
 #else
@@ skipping 181 matching lines @@
   }
   Node* Word64NotEqual(Node* a, Node* b) {
     return Word64BinaryNot(Word64Equal(a, b));
   }
   Node* Word64Not(Node* a) { return Word64Xor(a, Int64Constant(-1)); }
   Node* Word64BinaryNot(Node* a) { return Word64Equal(a, Int64Constant(0)); }
 
   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);
   }
   Node* Int32Div(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Int32Div(), a, b);
   }
   Node* Int32UDiv(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Int32UDiv(), a, b);
   }
@@ skipping 155 matching lines @@
 #undef NEW_NODE_3
 #undef MACHINE
 #undef COMMON
 #undef ZONE
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_NODE_FACTORY_H_