[Atomics] Remove Atomics code stubs; use TF ops

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index a19d876dd96a0059eb9574adcd8f90a071f4be02..7727767756781f270652601b35bf8964475bc7ac 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -563,10 +563,5 @@ Callable CodeFactory::InterpreterCEntry(Isolate* isolate, int result_size) {
   return Callable(stub.GetCode(), InterpreterCEntryDescriptor(isolate));
 }
 
-Callable CodeFactory::AtomicsLoad(Isolate* isolate) {
-  AtomicsLoadStub stub(isolate);
-  return Callable(stub.GetCode(), AtomicsLoadDescriptor(isolate));
-}
-
 }  // namespace internal
 }  // namespace v8