[turbofan] Optimized support for CreateGeneratorObject.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 9a25b08c63b9d1a5500d342396a327e9b26dbc47..5efa6300efce6d813521ad3dfa92f9d20fb33a88 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -423,6 +423,12 @@ void JSGenericLowering::LowerJSCreateFunctionContext(Node* node) {
   }
 }
 
+void JSGenericLowering::LowerJSCreateGeneratorObject(Node* node) {
+  CallDescriptor::Flags flags = FrameStateFlagForCall(node);
+  Callable callable =
+      Builtins::CallableFor(isolate(), Builtins::kCreateGeneratorObject);
+  ReplaceWithStubCall(node, callable, flags);
+}
 
 void JSGenericLowering::LowerJSCreateIterResultObject(Node* node) {
   ReplaceWithRuntimeCall(node, Runtime::kCreateIterResultObject);