api accessor store ics should return passed value

src/a64/stub-cache-a64.cc

Index: src/a64/stub-cache-a64.cc
diff --git a/src/a64/stub-cache-a64.cc b/src/a64/stub-cache-a64.cc
index 19f9dd604330173f84e8af65794471f141d014fa..adb835506a0dfad3dfdbae7efd217eb9612b9d99 100644
--- a/src/a64/stub-cache-a64.cc
+++ b/src/a64/stub-cache-a64.cc
@@ -750,6 +750,7 @@ static void GenerateFastApiCall(MacroAssembler* masm,
                                 Handle<Map> receiver_map,
                                 Register receiver,
                                 Register scratch,
+                                bool is_store,
                                 int argc,
                                 Register* values) {
   ASSERT(!AreAliased(receiver, scratch));
@@ -815,7 +816,7 @@ static void GenerateFastApiCall(MacroAssembler* masm,
   __ Mov(api_function_address, Operand(ref));
 
   // Jump to stub.
-  CallApiFunctionStub stub(true, call_data_undefined, argc);
+  CallApiFunctionStub stub(is_store, call_data_undefined, argc);
   __ TailCallStub(&stub);
 }
 
@@ -1047,7 +1048,8 @@ void LoadStubCompiler::GenerateLoadCallback(
     const CallOptimization& call_optimization,
     Handle<Map> receiver_map) {
   GenerateFastApiCall(
-      masm(), call_optimization, receiver_map, receiver(), scratch3(), 0, NULL);
+      masm(), call_optimization, receiver_map,
+      receiver(), scratch3(), false, 0, NULL);
 }
 
 
@@ -1540,7 +1542,7 @@ Handle<Code> StoreStubCompiler::CompileStoreCallback(
 
   Register values[] = { value() };
   GenerateFastApiCall(masm(), call_optimization, handle(object->map()),
-                      receiver(), scratch3(), 1, values);
+                      receiver(), scratch3(), true, 1, values);
 
   // Return the generated code.
   return GetCode(kind(), Code::FAST, name);