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Before, pre-existing fwd decls of specializations got unloaded.
OTOH, any decl produced during (failed) template instantiation must
also be unloaded; see #6331. Those are easiest identified by unloading
the whole (failed) transaction.
```
error: no member named 'value' in 'std::__and_<std::is_copy_assignable<std::__cxx11::basic_string<char> >, std::is_copy_assignable<Inner<int> > >'
is_copy_assignable<_T2>>::value,
~~~~~~~~~~~~~~~~~~~~~~~~~~^
```
which is due to the first decl being invalid (as `Inner<int>` does not have a deinition and a `static_assert` /usr/lib/gcc/x86_64-redhat-linux/10/../../../../include/c++/10/type_traits:1093 being triggered), then not unloaded, and then picked up again where we *do* have the definition for `Inner<int>`.
Add test for templt spec lookup vs unloading.
2b1af22926