[libc++] Introduce __specialized_algorithms

[philnik777]

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⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff origin/main HEAD --extensions ,h -- libcxx/include/__algorithm/specialized_algorithms.h libcxx/include/__algorithm/fill_n.h libcxx/include/__bit_reference --diff_from_common_commit

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View the diff from clang-format here.

diff --git a/libcxx/include/__algorithm/specialized_algorithms.h b/libcxx/include/__algorithm/specialized_algorithms.h
index 532927468..56b59d724 100644
--- a/libcxx/include/__algorithm/specialized_algorithms.h
+++ b/libcxx/include/__algorithm/specialized_algorithms.h
@@ -19,7 +19,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 // FIXME: This should really be an enum
 namespace _Algorithm {
-  struct __fill_n {};
+struct __fill_n {};
 } // namespace _Algorithm
 
 template <class>