[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 deb125f224d9221b579dd4accc806d0bfa06f0a0..19c84498bced7dccba6c1e4680dd8e1a352b3e19 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -140,6 +140,8 @@ 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