Overload makeHandle<T> for PseudoHandle<HermesValue>.

Summary:
This will allow `runtime->makeHandle<T>(std::move(pseudoHandle))`
by `vmcast`ing the `pseudoHandle` to `T`.

Reviewed By: tmikov

Differential Revision: D19746824

fbshipit-source-id: 176217f34ef52a15325cee577b73750b98d2c4cc

include/hermes/VM/HandleRootOwner.h

@@ -76,6 +76,14 @@ class HandleRootOwner {
  return res;
  }
 
+ /// Create a Handle from a valid PseudoHandle by vmcasting from HermesValue
+ /// and invalidate the PseudoHandle<HermesValue>.
+ template <class T>
+ Handle<T> makeHandle(PseudoHandle<HermesValue> &&pseudo) {
+ Handle<T> res{this, PseudoHandle<T>::vmcast(std::move(pseudo)).get()};
+ return res;
+ }
+
  /// Convenience function to create a MutableHandle.
  MutableHandle<HermesValue> makeMutableHandle(HermesValue value);
  /// Convenience function to create a MutableHandle from a pointer.