[turbofan] Add Int32AddWithOverflow machine operator.

src/compiler/code-generator-impl.h

 // Copyright 2013 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_CODE_GENERATOR_IMPL_H_
 #define V8_COMPILER_CODE_GENERATOR_IMPL_H_
 
 #include "src/compiler/code-generator.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/generic-graph.h"
@@ skipping 54 matching lines @@
   }
 
   BasicBlock* InputBlock(int index) {
     NodeId block_id = static_cast<NodeId>(instr_->InputAt(index)->index());
     // operand should be a block id.
     ASSERT(block_id >= 0);
     ASSERT(block_id < gen_->schedule()->BasicBlockCount());
     return gen_->schedule()->GetBlockById(block_id);
   }
 
-  Register OutputRegister() { return ToRegister(instr_->Output()); }
+  Register OutputRegister(int index = 0) {
+    return ToRegister(instr_->OutputAt(index));
+  }
 
   DoubleRegister OutputDoubleRegister() {
     return ToDoubleRegister(instr_->Output());
   }
 
   Register TempRegister(int index) { return ToRegister(instr_->TempAt(index)); }
 
   Register ToRegister(InstructionOperand* op) {
     ASSERT(op->IsRegister());
     return Register::FromAllocationIndex(op->index());
@@ skipping 35 matching lines @@
 #if V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_ARM
   masm->CheckConstPool(true, false);
 #endif
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_IMPL_H