[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 3befe1aeec11f3f2f64fbddf8ea6aeafa490a09c..fdd9245c8bb008f1178a7584bccc39edeaad7ac9 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -375,5 +375,11 @@ 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