Suppress IL2121

Author: TanayParikh

Directory.Build.props

@@ -119,6 +119,9 @@
 
     <!-- xUnit1004 = warns about skipped tests. Make this a non-fatal build warning. -->
     <WarningsNotAsErrors>$(WarningsNotAsErrors);xUnit1004</WarningsNotAsErrors>
+    
+    <!-- don't warn about unnecessary trim warning suppressions. can be removed with preview 6. -->
+    <NoWarn>$(NoWarn);IL2121</NoWarn>
   </PropertyGroup>
 
   <!-- Source code settings -->