swift

5b3967ba - [Backtracing][Freestanding] Add _stat to the list of expected symbols.

[Backtracing][Freestanding] Add _stat to the list of expected symbols. The code in `stdlib/runtime/Paths.cpp` will use `stat()` if it finds it, but not otherwise. As a result, it can turn up in the symbols in the OSS freestanding build. rdar://106529399