11972 resync smatch

@@ -3,7 +3,7 @@
 /*
  * check-name: c11-thread-local
  * check-command: test-parsing -std=c11 $file
  *
  * check-output-ignore
- * check-output-contains: \[tls\]
+ * check-output-contains: \\[tls\\]
  */