Update implementation of atomics with latest Chromium version but use compiler builtin atomics

test/cctest/test-atomicops.cc

 // Copyright 2014 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 175 matching lines @@
   const AtomicType kVal1 = TestFillValue<AtomicType>();
   const AtomicType kVal2 = static_cast<AtomicType>(-1);
 
   AtomicType value;
 
   NoBarrier_Store(&value, kVal1);
   CHECK_EQU(kVal1, value);
   NoBarrier_Store(&value, kVal2);
   CHECK_EQU(kVal2, value);
 
-  Acquire_Store(&value, kVal1);
-  CHECK_EQU(kVal1, value);
-  Acquire_Store(&value, kVal2);
-  CHECK_EQU(kVal2, value);
-
   Release_Store(&value, kVal1);
   CHECK_EQU(kVal1, value);
   Release_Store(&value, kVal2);
   CHECK_EQU(kVal2, value);
 }
 
 
 // Merge this test with TestStore as soon as we have Atomic8 acquire
 // and release stores.
 static void TestStoreAtomic8() {
@@ skipping 20 matching lines @@
 
   value = kVal1;
   CHECK_EQU(kVal1, NoBarrier_Load(&value));
   value = kVal2;
   CHECK_EQU(kVal2, NoBarrier_Load(&value));
 
   value = kVal1;
   CHECK_EQU(kVal1, Acquire_Load(&value));
   value = kVal2;
   CHECK_EQU(kVal2, Acquire_Load(&value));
-
-  value = kVal1;
-  CHECK_EQU(kVal1, Release_Load(&value));
-  value = kVal2;
-  CHECK_EQU(kVal2, Release_Load(&value));
 }
 
 
 // Merge this test with TestLoad as soon as we have Atomic8 acquire
 // and release loads.
 static void TestLoadAtomic8() {
   const Atomic8 kVal1 = TestFillValue<Atomic8>();
   const Atomic8 kVal2 = static_cast<Atomic8>(-1);
 
   Atomic8 value;
@@ skipping 34 matching lines @@
   TestStore<Atomic32>();
   TestStore<AtomicWord>();
 }
 
 
 TEST(Load) {
   TestLoadAtomic8();
   TestLoad<Atomic32>();
   TestLoad<AtomicWord>();
 }