Remove call to ErrorFacts.PreventsSuccessfulDelegateConversion(xCode), since...

Remove call to ErrorFacts.PreventsSuccessfulDelegateConversion(xCode), since no longer necessary, and not necessarily an optimisation

src/Compilers/CSharp/Portable/BoundTree/UnboundLambda.cs

@@ -976,13 +976,6 @@ private static int CanonicallyCompareDiagnostics(Diagnostic x, Diagnostic y)
             if (codeCompare != 0)
                 return codeCompare;
 
-            // ToString fails for a diagnostic with an error code that does not prevent successful delegate conversion.
-            // Also, the order doesn't matter, since all such diagnostics will be dropped.
-            if (!ErrorFacts.PreventsSuccessfulDelegateConversion(xCode))
-            {
-                return codeCompare;
-            }
-
             for (int i = 0; i < Math.Min(x.Arguments.Count, y.Arguments.Count); i++)
             {
                 object argx = x.Arguments[i];