Disable the test for checked casts on Mono

Author: SingleAccretion

src/tests/issues.targets

@@ -1044,6 +1044,9 @@
 
     <!-- Known failures for mono runtime on *all* architectures/operating systems -->
     <ItemGroup Condition="'$(RuntimeFlavor)' == 'mono'" >
+        <ExcludeList Include="$(XunitTestBinBase)/JIT/Directed/Convert/value_numbering_checked_casts_of_constants/*">
+            <Issue>Test not yet merged, issue will be created if the PR is to be approved</Issue>
+        </ExcludeList>
         <ExcludeList Include="$(XunitTestBinBase)/JIT/Directed/Convert/out_of_range_fp_to_int_conversions/*">
             <Issue>Mono does not define out of range fp to int conversions</Issue>
         </ExcludeList>