[Atomics] code stubs for atomic operations

src/code-factory.h

Index: src/code-factory.h
diff --git a/src/code-factory.h b/src/code-factory.h
index 5996a37dc7e36b3c100b862f15e00be299ea0c7b..596e88e7a79d2b807de96d7e1eaf538ed8451882 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -112,6 +112,8 @@ class CodeFactory final {
   static Callable InterpreterPushArgsAndCall(Isolate* isolate);
   static Callable InterpreterPushArgsAndConstruct(Isolate* isolate);
   static Callable InterpreterCEntry(Isolate* isolate, int result_size = 1);
+
+  static Callable AtomicsLoad(Isolate* isolate);
 };
 
 }  // namespace internal