Use the BitField class for Code::Flags.

src/x64/macro-assembler-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3285 matching lines @@
       j(not_equal, miss);
     }
   }
 
   bind(&done);
   // Check that the value is a normal propety.
   const int kDetailsOffset =
       NumberDictionary::kElementsStartOffset + 2 * kPointerSize;
   ASSERT_EQ(NORMAL, 0);
   Test(FieldOperand(elements, r2, times_pointer_size, kDetailsOffset),
-       Smi::FromInt(PropertyDetails::TypeField::mask()));
+       Smi::FromInt(PropertyDetails::TypeField::kMask));
   j(not_zero, miss);
 
   // Get the value at the masked, scaled index.
   const int kValueOffset =
       NumberDictionary::kElementsStartOffset + kPointerSize;
   movq(result, FieldOperand(elements, r2, times_pointer_size, kValueOffset));
 }
 
 
 void MacroAssembler::LoadAllocationTopHelper(Register result,
@@ skipping 571 matching lines @@
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64