api accessor store ics should return passed value

src/a64/code-stubs-a64.cc

 // Copyright 2013 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 5563 matching lines @@
   //  -- sp[argc * 8]        : receiver
   // -----------------------------------
 
   Register callee = x0;
   Register call_data = x4;
   Register holder = x2;
   Register api_function_address = x1;
   Register context = cp;
 
   int argc = ArgumentBits::decode(bit_field_);
-  bool restore_context = RestoreContextBits::decode(bit_field_);
+  bool is_store = IsStoreBits::decode(bit_field_);
   bool call_data_undefined = CallDataUndefinedBits::decode(bit_field_);
 
   typedef FunctionCallbackArguments FCA;
 
   STATIC_ASSERT(FCA::kContextSaveIndex == 6);
   STATIC_ASSERT(FCA::kCalleeIndex == 5);
   STATIC_ASSERT(FCA::kDataIndex == 4);
   STATIC_ASSERT(FCA::kReturnValueOffset == 3);
   STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
   STATIC_ASSERT(FCA::kIsolateIndex == 1);
@@ skipping 52 matching lines @@
   const int kStackUnwindSpace = argc + FCA::kArgsLength + 1;
   Address thunk_address = FUNCTION_ADDR(&InvokeFunctionCallback);
   ExternalReference::Type thunk_type = ExternalReference::PROFILING_API_CALL;
   ApiFunction thunk_fun(thunk_address);
   ExternalReference thunk_ref = ExternalReference(&thunk_fun, thunk_type,
       masm->isolate());
 
   AllowExternalCallThatCantCauseGC scope(masm);
   MemOperand context_restore_operand(
       fp, (2 + FCA::kContextSaveIndex) * kPointerSize);
-  MemOperand return_value_operand(fp,
-                                  (2 + FCA::kReturnValueOffset) * kPointerSize);
+  // Stores return the first js argument
+  int return_value_offset =
+      2 + (is_store ? FCA::kArgsLength : FCA::kReturnValueOffset);
+  MemOperand return_value_operand(fp, return_value_offset * kPointerSize);
 
   const int spill_offset = 1 + kApiStackSpace;
   __ CallApiFunctionAndReturn(api_function_address,
                               thunk_ref,
                               kStackUnwindSpace,
                               spill_offset,
                               return_value_operand,
-                              restore_context ?
-                                  &context_restore_operand : NULL);
+                              &context_restore_operand);
 }
 
 
 void CallApiGetterStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- sp[0]                  : name
   //  -- sp[8 - kArgsLength*8]  : PropertyCallbackArguments object
   //  -- ...
   //  -- x2                     : api_function_address
   // -----------------------------------
@@ skipping 34 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64