<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/76740>76740</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Clang Tidy] performance-avoid-endl converts std::endl to '\n' even when preceded by another constant string
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          battre
      </td>
    </tr>
</table>

<pre>
    `clang-tidy -checks=performance-avoid-endl -fix` converts `std::endl` to `'\n'` even when preceded by another constant string.

# Minimum Test case:

```
#include <iostream>

void foo() {
  std::cerr << "Hello World!" << std::endl;
}
```
# Observed behavior

After running `clang-tidy -checks=performance-avoid-endl -fix main.cc` the file looks as follows:

```
#include <iostream>

void foo() {
  std::cerr << "Hello World!" << '\n';
}
```

# Expected output

I think it would make sense to generate
```
#include <iostream>

void foo() {
 std::cerr << "Hello World!\n";
}
```
</pre>
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