[libunwind] [libunwind][test] Add .clang-format (PR #209364)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libunwind

Author: Hubert Tong (hubert-reinterpretcast)

<details>
<summary>Changes</summary>

Borrow from `libcxx/test/.clang-format` to avoid `clang-format` suggestions that are incompatible with `FileCheck`.

---
Full diff: https://github.com/llvm/llvm-project/pull/209364.diff


1 Files Affected:

- (added) libunwind/test/.clang-format (+4) 


``````````diff
diff --git a/libunwind/test/.clang-format b/libunwind/test/.clang-format
new file mode 100644
index 0000000000000..74990cb550d3c
--- /dev/null
+++ b/libunwind/test/.clang-format
@@ -0,0 +1,4 @@
+BasedOnStyle: InheritParentConfig
+
+# Disable formatting options which may break tests.
+ReflowComments: false

``````````

</details>


https://github.com/llvm/llvm-project/pull/209364