[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 2abc41a8ef08c5914ca268cce43f8e4b0b9c19db..ec270ec843b6de2f60b3775777d05d67d4372eb6 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -143,6 +143,8 @@ class CodeFactory final {
                                              TailCallMode tail_call_mode);
   static Callable InterpreterPushArgsAndConstruct(Isolate* isolate);
   static Callable InterpreterCEntry(Isolate* isolate, int result_size = 1);
+
+  static Callable AtomicsLoad(Isolate* isolate);
 };
 
 }  // namespace internal