--- a/gcc/inchash.h	Thu Oct 25 08:08:40 2018 +0900
+++ b/gcc/inchash.h	Thu Oct 25 10:21:07 2018 +0900
@@ -1,5 +1,5 @@
 /* An incremental hash abstract data type.
-   Copyright (C) 2014-2017 Free Software Foundation, Inc.
+   Copyright (C) 2014-2018 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -57,12 +57,28 @@
     val = iterative_hash_hashval_t (v, val);
   }
 
+  /* Add polynomial value V, treating each element as an unsigned int.  */
+  template<unsigned int N, typename T>
+  void add_poly_int (const poly_int_pod<N, T> &v)
+  {
+    for (unsigned int i = 0; i < N; ++i)
+      add_int (v.coeffs[i]);
+  }
+
   /* Add HOST_WIDE_INT value V.  */
   void add_hwi (HOST_WIDE_INT v)
   {
     val = iterative_hash_host_wide_int (v, val);
   }
 
+  /* Add polynomial value V, treating each element as a HOST_WIDE_INT.  */
+  template<unsigned int N, typename T>
+  void add_poly_hwi (const poly_int_pod<N, T> &v)
+  {
+    for (unsigned int i = 0; i < N; ++i)
+      add_hwi (v.coeffs[i]);
+  }
+
   /* Add wide_int-based value V.  */
   template<typename T>
   void add_wide_int (const generic_wide_int<T> &x)