[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 7c2c1742a11b6da86cff73f10fa567646c540485..8351c6016778576b2ef24cea59c7eb7d46215664 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -114,6 +114,8 @@ 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