Imported Upstream version 5.18.0.142

Former-commit-id: 7467d4b717762eeaf652d77f1486dd11ffb1ff1f

mcs/class/System.Core/System.IO.Pipes/SafePipeHandle.NotSupported.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Security;
+
+namespace Microsoft.Win32.SafeHandles
+{
+	public sealed partial class SafePipeHandle : SafeHandleZeroOrMinusOneIsInvalid
+	{
+		private const int DefaultInvalidHandle = -1;
+		
+		protected override bool ReleaseHandle()
+		{
+			throw new PlatformNotSupportedException();
+		}
+	}
+}