[libc++] Use template variables in a bunch of places instead of class templates

[philnik777]

This reduces compile time and memory, since template variables are more efficient. NFC otherwise.

[github-actions]

⚠️ 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,cpp -- libcxx/include/__algorithm/equal.h libcxx/include/__algorithm/equal_range.h libcxx/include/__algorithm/find.h libcxx/include/__algorithm/includes.h libcxx/include/__algorithm/is_permutation.h libcxx/include/__algorithm/lexicographical_compare.h libcxx/include/__algorithm/lower_bound.h libcxx/include/__algorithm/max_element.h libcxx/include/__algorithm/min_element.h libcxx/include/__algorithm/minmax.h libcxx/include/__algorithm/minmax_element.h libcxx/include/__algorithm/mismatch.h libcxx/include/__algorithm/partial_sort_copy.h libcxx/include/__algorithm/search.h libcxx/include/__algorithm/search_n.h libcxx/include/__algorithm/upper_bound.h libcxx/include/__expected/expected.h libcxx/include/__expected/unexpected.h libcxx/include/__functional/bind.h libcxx/include/__hash_table libcxx/include/__mdspan/extents.h libcxx/include/__mdspan/layout_left.h libcxx/include/__mdspan/layout_right.h libcxx/include/__mdspan/layout_stride.h libcxx/include/__memory/shared_ptr.h libcxx/include/__random/discard_block_engine.h libcxx/include/__random/independent_bits_engine.h libcxx/include/__random/is_seed_sequence.h libcxx/include/__random/linear_congruential_engine.h libcxx/include/__random/mersenne_twister_engine.h libcxx/include/__random/shuffle_order_engine.h libcxx/include/__random/subtract_with_carry_engine.h libcxx/include/__string/constexpr_c_functions.h libcxx/include/__type_traits/invoke.h libcxx/include/__type_traits/is_callable.h libcxx/include/__type_traits/is_core_convertible.h libcxx/include/__type_traits/is_equality_comparable.h libcxx/include/__type_traits/is_reference_wrapper.h libcxx/include/__utility/in_place.h libcxx/include/__utility/is_pointer_in_range.h libcxx/include/any libcxx/include/cwchar libcxx/include/experimental/propagate_const libcxx/include/optional libcxx/include/span libcxx/include/valarray libcxx/include/variant libcxx/test/libcxx/type_traits/is_callable.compile.pass.cpp libcxx/test/libcxx/type_traits/is_trivially_comparable.compile.pass.cpp libcxx/test/libcxx/utilities/utility/__is_inplace_index.pass.cpp libcxx/test/libcxx/utilities/utility/__is_inplace_type.pass.cpp --diff_from_common_commit

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View the diff from clang-format here.

diff --git a/libcxx/include/__algorithm/find.h b/libcxx/include/__algorithm/find.h
index 4541473f5..00616aac0 100644
--- a/libcxx/include/__algorithm/find.h
+++ b/libcxx/include/__algorithm/find.h
@@ -114,11 +114,10 @@ _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp* __find_vectorized(_Tp* __first, _Tp* __last,
 
 #ifndef _LIBCPP_CXX03_LANG
 // trivially equality comparable implementations
-template <
-    class _Tp,
-    class _Up,
-    class _Proj,
-    __enable_if_t<__is_identity<_Proj>::value && __is_trivially_equality_comparable_v<_Tp, _Up>, int> = 0>
+template < class _Tp,
+           class _Up,
+           class _Proj,
+           __enable_if_t<__is_identity<_Proj>::value && __is_trivially_equality_comparable_v<_Tp, _Up>, int> = 0>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp* __find(_Tp* __first, _Tp* __last, const _Up& __value, _Proj&) {
   if constexpr (sizeof(_Tp) == 1) {
     if (auto __ret = std::__constexpr_memchr(__first, __value, __last - __first))
diff --git a/libcxx/include/cwchar b/libcxx/include/cwchar
index 03db9e5fb..d41af176f 100644
--- a/libcxx/include/cwchar
+++ b/libcxx/include/cwchar
@@ -231,7 +231,7 @@ __constexpr_wmemcmp(const wchar_t* __lhs, const wchar_t* __rhs, size_t __count)
 
 template <class _Tp, class _Up>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp* __constexpr_wmemchr(_Tp* __str, _Up __value, size_t __count) {
-  static_assert(sizeof(_Tp) == sizeof(wchar_t)&& _LIBCPP_ALIGNOF(_Tp) >= _LIBCPP_ALIGNOF(wchar_t) &&
+  static_assert(sizeof(_Tp) == sizeof(wchar_t) && _LIBCPP_ALIGNOF(_Tp) >= _LIBCPP_ALIGNOF(wchar_t) &&
                     __is_trivially_equality_comparable_v<_Tp, _Tp>,
                 "Calling wmemchr on non-trivially equality comparable types is unsafe.");