[clang-tools-extra] [clang-tidy] Fix some false positive in bugprone-move-forwarding-reference (PR #191435)

[via cfe-commits]

github-actions[bot] wrote:

<!--LLVM CODE LINT COMMENT: clang-tidy-->


:warning: C/C++ code linter, clang-tidy found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

```bash

git diff -U0 origin/main...HEAD -- clang-tools-extra/clang-tidy/bugprone/MoveForwardingReferenceCheck.cpp |
python3 clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py   -path build -p1 -quiet
```

</details>

<details>
<summary>
View the output from clang-tidy here.
</summary>

```
clang-tools-extra/clang-tidy/bugprone/MoveForwardingReferenceCheck.cpp:22:1: warning: anonymous namespace not terminated with a closing comment [llvm-namespace-comment]
   22 | }
      | ^
      |   // namespace
clang-tools-extra/clang-tidy/bugprone/MoveForwardingReferenceCheck.cpp:16:11: note: anonymous namespace starts here
   16 | namespace {
      |           ^
```

</details>


https://github.com/llvm/llvm-project/pull/191435