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Revert "[libc++] Implement LWG1203"

Authored by teemperor on Sep 23 2020, 1:03 AM.

Description

Revert "[libc++] Implement LWG1203"

This reverts commit fdc41e11f9687a50c97e2a59663bf2d541ff5489. It causes the
libcxx/modules/stds_include.sh.cpp test to fail with:
libcxx/include/ostream:1039:45: error: no template named 'enable_if_t'; did you mean 'enable_if'?
template <class _Stream, class _Tp, class = enable_if_t<

Still investigating what's causing this and reverting in the meantime to get
the bots green again.