[llvm] [llvm] terminate namespace with closing comment (PR #94917)

[Owen Pan via llvm-commits]

owenca wrote:

This is a limitation of clang-format:
```
$ cat .clang-format
BasedOnStyle: LLVM
$ cat test.cpp
namespace {
  int i;
  int j;
}
$ clang-format -version
clang-format version 18.1.7
$ clang-format test.cpp | diff test.cpp -
2,4c2,4
<   int i;
<   int j;
< }
---
> int i;
> int j;
> } // namespace
$ clang-format -lines=4:4 test.cpp | diff test.cpp -
4c4
< }
---
>   } // namespace
$ 
```
You can work around this by fixing the indentation of the lines within the namespace in the same patch:
```
$ clang-format -lines=2:3 -i test.cpp
$ cat test.cpp
namespace {
int i;
int j;
}
$ clang-format -lines=4:4 test.cpp | diff test.cpp -
4c4
< }
---
> } // namespace
$ 
```

https://github.com/llvm/llvm-project/pull/94917