[turbofan] Add Int64(Add|Sub)WithOverflow support.

src/compiler/machine-operator.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_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
 #include "src/base/flags.h"
 #include "src/machine-type.h"
 
@@ skipping 174 matching lines @@
   const Operator* Int32LessThanOrEqual();
   const Operator* Uint32Div();
   const Operator* Uint32LessThan();
   const Operator* Uint32LessThanOrEqual();
   const Operator* Uint32Mod();
   const Operator* Uint32MulHigh();
   bool Int32DivIsSafe() const { return flags_ & kInt32DivIsSafe; }
   bool Uint32DivIsSafe() const { return flags_ & kUint32DivIsSafe; }
 
   const Operator* Int64Add();
+  const Operator* Int64AddWithOverflow();
   const Operator* Int64Sub();
+  const Operator* Int64SubWithOverflow();
   const Operator* Int64Mul();
   const Operator* Int64Div();
   const Operator* Int64Mod();
   const Operator* Int64LessThan();
   const Operator* Int64LessThanOrEqual();
   const Operator* Uint64Div();
   const Operator* Uint64LessThan();
   const Operator* Uint64LessThanOrEqual();
   const Operator* Uint64Mod();
 
@@ skipping 147 matching lines @@
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_