[turbofan] Assign appropriate types to some Date builtins.

src/compiler/access-builder.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_ACCESS_BUILDER_H_
 #define V8_COMPILER_ACCESS_BUILDER_H_
 
 #include "src/compiler/simplified-operator.h"
 #include "src/elements-kind.h"
 
@@ skipping 71 matching lines @@
 
   // Provides access to JSArrayBufferView::byteLength() field.
   static FieldAccess ForJSArrayBufferViewByteLength();
 
   // Provides access to JSArrayBufferView::byteOffset() field.
   static FieldAccess ForJSArrayBufferViewByteOffset();
 
   // Provides access to JSTypedArray::length() field.
   static FieldAccess ForJSTypedArrayLength();
 
+  // Provides access to JSDate::value() field.
+  static FieldAccess ForJSDateValue();
+
   // Provides access to JSDate fields.
   static FieldAccess ForJSDateField(JSDate::FieldIndex index);
 
   // Provides access to JSIteratorResult::done() field.
   static FieldAccess ForJSIteratorResultDone();
 
   // Provides access to JSIteratorResult::value() field.
   static FieldAccess ForJSIteratorResultValue();
 
   // Provides access to JSRegExp::flags() field.
@@ skipping 101 matching lines @@
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AccessBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ACCESS_BUILDER_H_