[turbofan] Introduce new Select operator to improve bounds checking.

src/compiler/machine-type.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_TYPE_H_
 #define V8_COMPILER_MACHINE_TYPE_H_
 
 #include <iosfwd>
 
 #include "src/base/bits.h"
@@ skipping 32 matching lines @@
   kMachFloat32 = kRepFloat32 | kTypeNumber,
   kMachFloat64 = kRepFloat64 | kTypeNumber,
   kMachInt8 = kRepWord8 | kTypeInt32,
   kMachUint8 = kRepWord8 | kTypeUint32,
   kMachInt16 = kRepWord16 | kTypeInt32,
   kMachUint16 = kRepWord16 | kTypeUint32,
   kMachInt32 = kRepWord32 | kTypeInt32,
   kMachUint32 = kRepWord32 | kTypeUint32,
   kMachInt64 = kRepWord64 | kTypeInt64,
   kMachUint64 = kRepWord64 | kTypeUint64,
+  kMachIntPtr = (kPointerSize == 4) ? kMachInt32 : kMachInt64,
+  kMachUintPtr = (kPointerSize == 4) ? kMachUint32 : kMachUint64,
   kMachPtr = (kPointerSize == 4) ? kRepWord32 : kRepWord64,
   kMachAnyTagged = kRepTagged | kTypeAny
 };
 
 std::ostream& operator<<(std::ostream& os, const MachineType& type);
 
 typedef uint16_t MachineTypeUnion;
 
 // Globally useful machine types and constants.
 const MachineTypeUnion kRepMask = kRepBit | kRepWord8 | kRepWord16 |
@@ skipping 101 matching lines @@
   size_t parameter_count_;
   T* reps_;
 };
 
 typedef Signature<MachineType> MachineSignature;
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_TYPE_H_