fixup: use expected-error in the lit test

Author: abulavin

mlir/test/mlir-opt/local-reproducer-with-threading.mlir

@@ -1,9 +1,7 @@
 // Test that attempting to create a local crash reproducer without disabling threading
 // prints an error from the pass manager (as opposed to crashing with a stack trace).
 
-// We need to use `||` in the RUN command because lit will fail the test due to mlir-opt
-// returning non-zero status for this test case, however this is the intended behaviour.
+// RUN: mlir-opt --verify-diagnostics --mlir-pass-pipeline-local-reproducer \
+// RUN:          --mlir-pass-pipeline-crash-reproducer=%t %s
 
-// RUN: mlir-opt --mlir-pass-pipeline-local-reproducer --mlir-pass-pipeline-crash-reproducer=%t %s 2>&1 || FileCheck --input-file %s %s
-
-// CHECK: error: Local crash reproduction may not be used without disabling mutli-threading first.
+// expected-error@unknown {{Local crash reproduction may not be used without disabling mutli-threading first.}}