Load getter from map descriptor instead of embedding it in handler.

src/ic/x64/handler-compiler-x64.cc

Index: src/ic/x64/handler-compiler-x64.cc
diff --git a/src/ic/x64/handler-compiler-x64.cc b/src/ic/x64/handler-compiler-x64.cc
index 1538f12ac8141d6ce986b44cedf29c99e0f5f6c5..13b5fa804c2280ba01404b6dbf63f3bf43fc5eb9 100644
--- a/src/ic/x64/handler-compiler-x64.cc
+++ b/src/ic/x64/handler-compiler-x64.cc
@@ -255,7 +255,7 @@ void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
 
 void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
     MacroAssembler* masm, Handle<HeapType> type, Register receiver,
-    Handle<JSFunction> getter) {
+    Register holder, int accessor_index, int expected_arguments) {
   // ----------- S t a t e -------------
   //  -- rax    : receiver
   //  -- rcx    : name
@@ -264,7 +264,7 @@ void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
 
-    if (!getter.is_null()) {
+    if (accessor_index >= 0) {
       // Call the JavaScript getter with the receiver on the stack.
       if (IC::TypeToMap(*type, masm->isolate())->IsJSGlobalObjectMap()) {
         // Swap in the global receiver.
@@ -273,8 +273,14 @@ void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
       }
       __ Push(receiver);
       ParameterCount actual(0);
-      ParameterCount expected(getter);
-      __ InvokeFunction(getter, expected, actual, CALL_FUNCTION,
+      ParameterCount expected(expected_arguments);
+      Register scratch = holder;
+      __ movp(scratch, FieldOperand(holder, HeapObject::kMapOffset));
+      __ LoadInstanceDescriptors(scratch, scratch);
+      __ movp(scratch, FieldOperand(scratch, DescriptorArray::GetValueOffset(
+                                                 accessor_index)));
+      __ movp(rdi, FieldOperand(scratch, AccessorPair::kGetterOffset));
+      __ InvokeFunction(rdi, expected, actual, CALL_FUNCTION,
                         NullCallWrapper());
     } else {
       // If we generate a global code snippet for deoptimization only, remember