ART: Simplify atomic.h

Prefer std::atomic operations over wrappers in atomic.h. Exceptions
are cases that relate to the Java data memory operations and CAS
operations.

Bug: 71621075
Test: art/test.py --host -j32
Test: art/test.py --target --64 -j4
Change-Id: I9a157e9dede852c1b2aa67d22e3e604a68a9ef1c
diff --git a/runtime/gc/task_processor_test.cc b/runtime/gc/task_processor_test.cc
index 77b40e4..38581ce 100644
--- a/runtime/gc/task_processor_test.cc
+++ b/runtime/gc/task_processor_test.cc
@@ -37,7 +37,7 @@
     if (max_recursion_ > 0) {
       task_processor_->AddTask(self,
                                new RecursiveTask(task_processor_, counter_, max_recursion_ - 1));
-      counter_->FetchAndAddSequentiallyConsistent(1U);
+      counter_->fetch_add(1U, std::memory_order_seq_cst);
     }
   }
 
@@ -54,7 +54,7 @@
   }
   virtual void Run(Thread* self) OVERRIDE {
     task_processor_->RunAllTasks(self);
-    done_running_->StoreSequentiallyConsistent(true);
+    done_running_->store(true, std::memory_order_seq_cst);
   }
 
  private:
@@ -76,7 +76,7 @@
   thread_pool.StartWorkers(self);
   ASSERT_FALSE(done_running);
   // Wait until all the tasks are done, but since we didn't interrupt, done_running should be 0.
-  while (counter.LoadSequentiallyConsistent() != kRecursion) {
+  while (counter.load(std::memory_order_seq_cst) != kRecursion) {
     usleep(10);
   }
   ASSERT_FALSE(done_running);
@@ -84,11 +84,11 @@
   thread_pool.Wait(self, true, false);
   // After the interrupt and wait, the WorkUntilInterruptedTasktask should have terminated and
   // set done_running_ to true.
-  ASSERT_TRUE(done_running.LoadSequentiallyConsistent());
+  ASSERT_TRUE(done_running.load(std::memory_order_seq_cst));
 
   // Test that we finish remaining tasks before returning from RunTasksUntilInterrupted.
-  counter.StoreSequentiallyConsistent(0);
-  done_running.StoreSequentiallyConsistent(false);
+  counter.store(0, std::memory_order_seq_cst);
+  done_running.store(false, std::memory_order_seq_cst);
   // Self interrupt before any of the other tasks run, but since we added them we should keep on
   // working until all the tasks are completed.
   task_processor.Stop(self);
@@ -96,8 +96,8 @@
   thread_pool.AddTask(self, new WorkUntilDoneTask(&task_processor, &done_running));
   thread_pool.StartWorkers(self);
   thread_pool.Wait(self, true, false);
-  ASSERT_TRUE(done_running.LoadSequentiallyConsistent());
-  ASSERT_EQ(counter.LoadSequentiallyConsistent(), kRecursion);
+  ASSERT_TRUE(done_running.load(std::memory_order_seq_cst));
+  ASSERT_EQ(counter.load(std::memory_order_seq_cst), kRecursion);
 }
 
 class TestOrderTask : public HeapTask {
@@ -137,10 +137,10 @@
   Atomic<bool> done_running(false);
   // Add a task which will wait until interrupted to the thread pool.
   thread_pool.AddTask(self, new WorkUntilDoneTask(&task_processor, &done_running));
-  ASSERT_FALSE(done_running.LoadSequentiallyConsistent());
+  ASSERT_FALSE(done_running.load(std::memory_order_seq_cst));
   thread_pool.StartWorkers(self);
   thread_pool.Wait(self, true, false);
-  ASSERT_TRUE(done_running.LoadSequentiallyConsistent());
+  ASSERT_TRUE(done_running.load(std::memory_order_seq_cst));
   ASSERT_EQ(counter, kNumTasks);
 }