[clang] Suppress noreturn warning if last statement in a function is a throw (PR #145166)

[Yanzuo Liu via cfe-commits]

https://github.com/zwuis commented:

Thank you for the patch! Please add a release note in `clang/docs/ReleaseNotes.rst`.

I'm not sure if this case should be handled:
```cpp
if (condition) {
  throw 1;
} else {
  throw 2;
}
```
Maybe we need to open an issue for it.

https://github.com/llvm/llvm-project/pull/145166