Added polygamma function.
diff --git a/Eigen/src/Core/arch/CUDA/PacketMath.h b/Eigen/src/Core/arch/CUDA/PacketMath.h
index e0db18f..932df10 100644
--- a/Eigen/src/Core/arch/CUDA/PacketMath.h
+++ b/Eigen/src/Core/arch/CUDA/PacketMath.h
@@ -41,6 +41,7 @@
     HasLGamma = 1,
     HasDiGamma = 1,
     HasZeta = 1,
+    HasPolygamma = 1,
     HasErf = 1,
     HasErfc = 1,
     HasIgamma = 1,