[libcxx-commits] [libcxx] [llvm] [libc++] Optionally support filecheck-based tests (PR #165769)

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<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- libcxx/test/selftest/filecheck.negative.sh.cpp libcxx/test/selftest/filecheck.sh.cpp libcxx/test/selftest/splitfile.sh.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/test/selftest/splitfile.sh.cpp b/libcxx/test/selftest/splitfile.sh.cpp
index 0dae825f7..dfb4cae50 100644
--- a/libcxx/test/selftest/splitfile.sh.cpp
+++ b/libcxx/test/selftest/splitfile.sh.cpp
@@ -29,11 +29,8 @@
 
 //--- main.cpp
 
-int main() {
-  return 0;
-}
+int main() { return 0; }
 
 //--- input.txt
 
-foo
-bar
+foo bar

``````````

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https://github.com/llvm/llvm-project/pull/165769