[turbofan] Add support for Int32SubWithOverflow.

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

 // 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.
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler-intrinsics.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 598 matching lines @@
       CanCover(node, m.right().node())) {
     Int32BinopMatcher mright(m.right().node());
     Emit(kArmMls, g.DefineAsRegister(node), g.UseRegister(mright.left().node()),
          g.UseRegister(mright.right().node()), g.UseRegister(m.left().node()));
     return;
   }
   VisitBinop(this, node, kArmSub, kArmRsb);
 }
 
 
+void InstructionSelector::VisitInt32SubWithOverflow(Node* node) {
+  VisitBinopWithOverflow(this, node, kArmSub, kArmRsb);
+}
+
+
 void InstructionSelector::VisitInt32Mul(Node* node) {
   ArmOperandGenerator g(this);
   Int32BinopMatcher m(node);
   if (m.right().HasValue() && m.right().Value() > 0) {
     int32_t value = m.right().Value();
     if (IsPowerOf2(value - 1)) {
       Emit(kArmAdd | AddressingModeField::encode(kMode_Operand2_R_LSL_I),
            g.DefineAsRegister(node), g.UseRegister(m.left().node()),
            g.UseRegister(m.left().node()),
            g.TempImmediate(WhichPowerOf2(value - 1)));
@@ skipping 328 matching lines @@
     ASSERT(cont->IsSet());
     Emit(cont->Encode(kArmVcmpF64), g.DefineAsRegister(cont->result()),
          g.UseDoubleRegister(m.left().node()),
          g.UseDoubleRegister(m.right().node()));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8