[stubs] CSA::LoadFixedDoubleArrayElement() is now able to do a hole check.

src/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_MACHINE_TYPE_H_
 #define V8_MACHINE_TYPE_H_
 
 #include <iosfwd>
 
 #include "src/base/bits.h"
@@ skipping 44 matching lines @@
     return representation() == other.representation() &&
            semantic() == other.semantic();
   }
 
   bool operator!=(MachineType other) const { return !(*this == other); }
 
 
   MachineRepresentation representation() const { return representation_; }
   MachineSemantic semantic() const { return semantic_; }
 
+  bool IsNone() { return representation() == MachineRepresentation::kNone; }
+
   bool IsSigned() {
     return semantic() == MachineSemantic::kInt32 ||
            semantic() == MachineSemantic::kInt64;
   }
   bool IsUnsigned() {
     return semantic() == MachineSemantic::kUint32 ||
            semantic() == MachineSemantic::kUint64;
   }
 
   static MachineRepresentation PointerRepresentation() {
@@ skipping 186 matching lines @@
   UNREACHABLE();
   return -1;
 }
 
 typedef Signature<MachineType> MachineSignature;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MACHINE_TYPE_H_