[date] Migrate Date field accessors to native builtins.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index 9fcbe2dcab00f68c4cfbfe669c32745267925bca..6d8e9bcc0f63cc843e92c40df33cae85549a2381 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -1052,6 +1052,58 @@ void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
 }
 
 
+// static
+void Builtins::Generate_DatePrototype_GetField(MacroAssembler* masm,
+                                               int field_index) {
+  // ----------- S t a t e -------------
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : receiver
+  // -----------------------------------
+
+  // 1. Load receiver into rax and check that it's actually a JSDate object.
+  Label receiver_not_date;
+  {
+    StackArgumentsAccessor args(rsp, 0);
+    __ movp(rax, args.GetReceiverOperand());
+    __ JumpIfSmi(rax, &receiver_not_date);
+    __ CmpObjectType(rax, JS_DATE_TYPE, rbx);
+    __ j(not_equal, &receiver_not_date);
+  }
+
+  // 2. Load the specified date field, falling back to the runtime as necessary.
+  if (field_index == JSDate::kDateValue) {
+    __ movp(rax, FieldOperand(rax, JSDate::kValueOffset));
+  } else {
+    if (field_index < JSDate::kFirstUncachedField) {
+      Label stamp_mismatch;
+      __ Load(rdx, ExternalReference::date_cache_stamp(masm->isolate()));
+      __ cmpp(rdx, FieldOperand(rax, JSDate::kCacheStampOffset));
+      __ j(not_equal, &stamp_mismatch, Label::kNear);
+      __ movp(rax, FieldOperand(
+                       rax, JSDate::kValueOffset + field_index * kPointerSize));
+      __ ret(1 * kPointerSize);
+      __ bind(&stamp_mismatch);
+    }
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    __ PrepareCallCFunction(2);
+    __ Move(arg_reg_1, rax);
+    __ Move(arg_reg_2, Smi::FromInt(field_index));
+    __ CallCFunction(
+        ExternalReference::get_date_field_function(masm->isolate()), 2);
+  }
+  __ ret(1 * kPointerSize);
+
+  // 3. Raise a TypeError if the receiver is not a date.
+  __ bind(&receiver_not_date);
+  {
+    FrameScope scope(masm, StackFrame::MANUAL);
+    __ EnterFrame(StackFrame::INTERNAL);
+    __ CallRuntime(Runtime::kThrowNotDateError);
+  }
+}
+
+
+// static
 void Builtins::Generate_FunctionPrototypeApply(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax     : argc