[clang] [libcxx] libcxx: std::ostream::sentry should be exported (PR #140169)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions ,cpp,h -- clang/lib/Sema/SemaTemplateInstantiate.cpp clang/test/CodeGenCXX/mingw-template-dllexport.cpp libcxx/include/__ostream/basic_ostream.h libcxx/include/istream
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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/include/__ostream/basic_ostream.h b/libcxx/include/__ostream/basic_ostream.h
index 0e277c8ed..2b34b1957 100644
--- a/libcxx/include/__ostream/basic_ostream.h
+++ b/libcxx/include/__ostream/basic_ostream.h
@@ -665,16 +665,16 @@ basic_ostream<char, _Traits>& operator<<(basic_ostream<char, _Traits>&, const ch
 
 #  endif // _LIBCPP_STD_VER >= 20
 
-#if defined(__MINGW32__) || defined(__CYGWIN__)
+#  if defined(__MINGW32__) || defined(__CYGWIN__)
 extern template _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostream<char>::sentry::sentry(basic_ostream<char>& __os);
 extern template _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostream<char>::sentry::~sentry();
-#endif
+#  endif
 extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostream<char>;
 #  if _LIBCPP_HAS_WIDE_CHARACTERS
-#  if defined(__MINGW32__) || defined(__CYGWIN__)
+#    if defined(__MINGW32__) || defined(__CYGWIN__)
 extern template _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostream<wchar_t>::sentry::sentry(basic_ostream<wchar_t>& __os);
 extern template _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostream<wchar_t>::sentry::~sentry();
-#  endif
+#    endif
 extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostream<wchar_t>;
 #  endif
 

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https://github.com/llvm/llvm-project/pull/140169