[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 6166fb3377860bf456cb509e33f8c7072a3faf3f..196d6a81908d62b8dec38e15d0f30eccf015cbf2 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -545,5 +545,10 @@ 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