Add IsGeneratorFunction and IsGeneratorObject checks to v8::Value.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index f1d81ddd5fefa38f3704d11a6c1c7478f97e46c5..b2432cf895a02499ee677c4c5026e50e12b948f3 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -2568,6 +2568,19 @@ bool Value::IsRegExp() const {
 }
 
 
+bool Value::IsGeneratorFunction() const {
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  if (!obj->IsJSFunction()) return false;
+  i::Handle<i::JSFunction> func = i::Handle<i::JSFunction>::cast(obj);
+  return func->shared()->is_generator();
+}
+
+
+bool Value::IsGeneratorObject() const {
+  return Utils::OpenHandle(this)->IsJSGeneratorObject();
+}
+
+
 Local<String> Value::ToString() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> str;