[turbofan] Add Int32AddWithOverflow machine operator.

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index fee086ca536ca524839b0cf59f9205e6c7901bd1..a1f1ffa7e75b1100b8457bf8922e564f9e6f4504 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -114,6 +114,39 @@ static void VisitBinop(InstructionSelector* selector, Node* node,
 }
 
 
+static void VisitBinopWithOverflow(InstructionSelector* selector, Node* node,
+                                   InstructionCode opcode) {
+  Arm64OperandGenerator g(selector);
+  Int32BinopMatcher m(node);
+  InstructionOperand* inputs[2];
+  size_t input_count = 0;
+  InstructionOperand* outputs[2];
+  size_t output_count = 0;
+
+  inputs[input_count++] = g.UseRegister(m.left().node());
+  inputs[input_count++] = g.UseRegister(m.right().node());
+
+  // Define outputs depending on the projections.
+  Node* projections[2];
+  node->CollectProjections(ARRAY_SIZE(projections), projections);
+  if (projections[0]) {
+    outputs[output_count++] = g.DefineAsRegister(projections[0]);
+  }
+  if (projections[1]) {
+    opcode |= FlagsModeField::encode(kFlags_set);
+    opcode |= FlagsConditionField::encode(kOverflow);
+    outputs[output_count++] = g.DefineAsRegister(projections[1]);
+  }
+
+  ASSERT_NE(0, input_count);
+  ASSERT_NE(0, output_count);
+  ASSERT_GE(ARRAY_SIZE(inputs), input_count);
+  ASSERT_GE(ARRAY_SIZE(outputs), output_count);
+
+  selector->Emit(opcode, output_count, outputs, input_count, inputs);
+}
+
+
 void InstructionSelector::VisitLoad(Node* node) {
   MachineRepresentation rep = OpParameter<MachineRepresentation>(node);
   Arm64OperandGenerator g(this);
@@ -299,6 +332,11 @@ void InstructionSelector::VisitInt32Add(Node* node) {
 }
 
 
+void InstructionSelector::VisitInt32AddWithOverflow(Node* node) {
+  VisitBinopWithOverflow(this, node, kArm64Add32);
+}
+
+
 void InstructionSelector::VisitInt64Add(Node* node) {
   VisitBinop(this, node, kArm64Add, kArithimeticImm, true);
 }