[clang] [libcxx] [Cygwin][MinGW] Internal class in explicitly-instantiation-declarated template should be instantiated (PR #140145)

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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/src/ios.instantiations.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/src/ios.instantiations.cpp b/libcxx/src/ios.instantiations.cpp
index 6f58a2c75..230eb5892 100644
--- a/libcxx/src/ios.instantiations.cpp
+++ b/libcxx/src/ios.instantiations.cpp
@@ -31,10 +31,10 @@ template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_iostream<char>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ios<wchar_t>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_streambuf<wchar_t>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istream<wchar_t>;
-#ifdef _MSC_VER
+#  ifdef _MSC_VER
 template _LIBCPP_EXPORTED_FROM_ABI basic_ostream<wchar_t>::sentry::sentry(basic_ostream<wchar_t>& __os);
 template _LIBCPP_EXPORTED_FROM_ABI basic_ostream<wchar_t>::sentry::~sentry();
-#endif
+#  endif
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<wchar_t>;
 #endif
 

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https://github.com/llvm/llvm-project/pull/140145