[clang-tools-extra] [clang-tidy] Fix readability-else-after-return for if statements appear in unbraced switch case labels (PR #181878)

[Congcong Cai via cfe-commits]

https://github.com/HerrCai0907 commented:

In this case, fix it may not work anymore.

The first version is valid code but the second not.

```c++
void f(int v) {
  switch (v) {
  case 1:
    if (1)
      return;
    else
      int a = 20;
    break;
  case 2:
  }
}
```

```c++
void f(int v) {
  switch (v) {
  case 1:
    if (1)
      return;
    int a = 20;
    break;
  case 2:
  }
}
```

https://github.com/llvm/llvm-project/pull/181878
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