[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 9b6ac55c123ec4b338431edce98789b4afbdf2a9..71a6cf1009544c980690238a5efd24700f93fbf4 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -540,5 +540,10 @@ 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