Revert of [Atomics] code stubs for atomic operations

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 196d6a81908d62b8dec38e15d0f30eccf015cbf2..6166fb3377860bf456cb509e33f8c7072a3faf3f 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -545,10 +545,5 @@
   return Callable(stub.GetCode(), InterpreterCEntryDescriptor(isolate));
 }
 
-Callable CodeFactory::AtomicsLoad(Isolate* isolate) {
-  AtomicsLoadStub stub(isolate);
-  return Callable(stub.GetCode(), AtomicsLoadDescriptor(isolate));
-}
-
 }  // namespace internal
 }  // namespace v8