Imported Upstream version 4.4.2.4

Former-commit-id: 92904c9c5915c37244316e42ba99e7b934ed7ee2

mcs/class/System.Numerics.Vectors/System.Numerics/HashCodeHelper.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Numerics
+{
+    internal static class HashCodeHelper
+    {
+        /// <summary>
+        /// Combines two hash codes, useful for combining hash codes of individual vector elements
+        /// </summary>
+        internal static int CombineHashCodes(int h1, int h2)
+        {
+            return (((h1 << 5) + h1) ^ h2);
+        }
+    }
+}