[date] Migrate Date field accessors to native builtins.

src/full-codegen/x64/full-codegen-x64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 3303 matching lines @@
     __ AssertNotSmi(object);
     __ CmpObjectType(object, JS_DATE_TYPE, scratch);
     __ Check(equal, kOperandIsNotADate);
   }
 
   if (index->value() == 0) {
     __ movp(result, FieldOperand(object, JSDate::kValueOffset));
   } else {
     Label runtime, done;
     if (index->value() < JSDate::kFirstUncachedField) {
-      ExternalReference stamp = ExternalReference::date_cache_stamp(isolate());
-      Operand stamp_operand = __ ExternalOperand(stamp);
-      __ movp(scratch, stamp_operand);
+      __ Load(scratch, ExternalReference::date_cache_stamp(isolate()));
       __ cmpp(scratch, FieldOperand(object, JSDate::kCacheStampOffset));
       __ j(not_equal, &runtime, Label::kNear);
       __ movp(result, FieldOperand(object, JSDate::kValueOffset +
                                            kPointerSize * index->value()));
       __ jmp(&done, Label::kNear);
     }
     __ bind(&runtime);
     __ PrepareCallCFunction(2);
     __ movp(arg_reg_1, object);
     __ Move(arg_reg_2, index, Assembler::RelocInfoNone());
@@ skipping 1459 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64