[libc++] Format the code base (#74334)

This patch runs clang-format on all of libcxx/include and libcxx/src, in
accordance with the RFC discussed at [1]. Follow-up patches will format
the benchmarks, the test suite and remaining parts of the code. I'm
splitting this one into its own patch so the diff is a bit easier to
review.

This patch was generated with:

   find libcxx/include libcxx/src -type f \
      | grep -v 'module.modulemap.in' \
      | grep -v 'CMakeLists.txt' \
      | grep -v 'README.txt' \
      | grep -v 'libcxx.imp' \
      | grep -v '__config_site.in' \
      | xargs clang-format -i

A Git merge driver is available in libcxx/utils/clang-format-merge-driver.sh
to help resolve merge and rebase issues across these formatting changes.

[1]: https://discourse.llvm.org/t/rfc-clang-formatting-all-of-libc-once-and-for-all

1 files changed, 36 insertions, 48 deletions

diff --git a/libcxx/include/__algorithm/partition.h b/libcxx/include/__algorithm/partition.h
index a6aaf63..e2ceb07 100644
--- a/libcxx/include/__algorithm/partition.h
+++ b/libcxx/include/__algorithm/partition.h
@@ -23,70 +23,58 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Predicate, class _AlgPolicy, class _ForwardIterator, class _Sentinel>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator, _ForwardIterator>
-__partition_impl(_ForwardIterator __first, _Sentinel __last, _Predicate __pred, forward_iterator_tag)
-{
-    while (true)
-    {
-        if (__first == __last)
-            return std::make_pair(std::move(__first), std::move(__first));
-        if (!__pred(*__first))
-            break;
-        ++__first;
-    }
+__partition_impl(_ForwardIterator __first, _Sentinel __last, _Predicate __pred, forward_iterator_tag) {
+  while (true) {
+    if (__first == __last)
+      return std::make_pair(std::move(__first), std::move(__first));
+    if (!__pred(*__first))
+      break;
+    ++__first;
+  }
 
-    _ForwardIterator __p = __first;
-    while (++__p != __last)
-    {
-        if (__pred(*__p))
-        {
-            _IterOps<_AlgPolicy>::iter_swap(__first, __p);
-            ++__first;
-        }
+  _ForwardIterator __p = __first;
+  while (++__p != __last) {
+    if (__pred(*__p)) {
+      _IterOps<_AlgPolicy>::iter_swap(__first, __p);
+      ++__first;
     }
-    return std::make_pair(std::move(__first), std::move(__p));
+  }
+  return std::make_pair(std::move(__first), std::move(__p));
 }
 
 template <class _Predicate, class _AlgPolicy, class _BidirectionalIterator, class _Sentinel>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_BidirectionalIterator, _BidirectionalIterator>
-__partition_impl(_BidirectionalIterator __first, _Sentinel __sentinel, _Predicate __pred,
-            bidirectional_iterator_tag)
-{
-    _BidirectionalIterator __original_last = _IterOps<_AlgPolicy>::next(__first, __sentinel);
-    _BidirectionalIterator __last = __original_last;
+__partition_impl(_BidirectionalIterator __first, _Sentinel __sentinel, _Predicate __pred, bidirectional_iterator_tag) {
+  _BidirectionalIterator __original_last = _IterOps<_AlgPolicy>::next(__first, __sentinel);
+  _BidirectionalIterator __last          = __original_last;
 
-    while (true)
-    {
-        while (true)
-        {
-            if (__first == __last)
-                return std::make_pair(std::move(__first), std::move(__original_last));
-            if (!__pred(*__first))
-                break;
-            ++__first;
-        }
-        do
-        {
-            if (__first == --__last)
-                return std::make_pair(std::move(__first), std::move(__original_last));
-        } while (!__pred(*__last));
-        _IterOps<_AlgPolicy>::iter_swap(__first, __last);
-        ++__first;
+  while (true) {
+    while (true) {
+      if (__first == __last)
+        return std::make_pair(std::move(__first), std::move(__original_last));
+      if (!__pred(*__first))
+        break;
+      ++__first;
     }
+    do {
+      if (__first == --__last)
+        return std::make_pair(std::move(__first), std::move(__original_last));
+    } while (!__pred(*__last));
+    _IterOps<_AlgPolicy>::iter_swap(__first, __last);
+    ++__first;
+  }
 }
 
 template <class _AlgPolicy, class _ForwardIterator, class _Sentinel, class _Predicate, class _IterCategory>
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
-pair<_ForwardIterator, _ForwardIterator> __partition(
-    _ForwardIterator __first, _Sentinel __last, _Predicate&& __pred, _IterCategory __iter_category) {
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator, _ForwardIterator>
+__partition(_ForwardIterator __first, _Sentinel __last, _Predicate&& __pred, _IterCategory __iter_category) {
   return std::__partition_impl<__remove_cvref_t<_Predicate>&, _AlgPolicy>(
       std::move(__first), std::move(__last), __pred, __iter_category);
 }
 
 template <class _ForwardIterator, class _Predicate>
-inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
-_ForwardIterator
-partition(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred)
-{
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
+partition(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
   using _IterCategory = typename iterator_traits<_ForwardIterator>::iterator_category;
   auto __result = std::__partition<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred, _IterCategory());
   return __result.first;