[turbofan] Optimized support for CreateGeneratorObject.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index d514ef02dbe381bff503d8e782efa27a9cf385bd..ec67ba063f5e2dd95c53af761e0bc455da3830fa 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1116,6 +1116,10 @@ Type* Typer::Visitor::TypeJSCreateArguments(Node* node) {
 
 Type* Typer::Visitor::TypeJSCreateArray(Node* node) { return Type::Array(); }
 
+Type* Typer::Visitor::TypeJSCreateGeneratorObject(Node* node) {
+  return Type::OtherObject();
+}
+
 Type* Typer::Visitor::TypeJSCreateClosure(Node* node) {
   return Type::Function();
 }