[clang-tools-extra] [clang-tidy] Adds do-while support to performance-inefficient-string-concatenation (PR #186607)

[via cfe-commits]

================
@@ -315,6 +315,10 @@ Changes in existing checks
 
   - Fixes false negatives when using ``std::set`` from ``libstdc++``.
 
+- Improved :doc:`performance-inefficient-string-concatenation
+  <clang-tidy/checks/performance/inefficient-string-concatenation>` check by
+  adding support for detecting inefficient string concatenation in ``do-while`` loops.
----------------
EugeneZelenko wrote:

```suggestion
  adding support for detecting inefficient string concatenation in ``do-while``
  loops.
```

Somehow CI check did not complain :-(

https://github.com/llvm/llvm-project/pull/186607