PR71856 try to fix Parallel Mode assertions again
PR libstdc++/71856
* doc/xml/manual/using.xml: Document macro.
* include/bits/c++config [_GLIBCXX_DEBUG || _GLIBCXX_PARALLEL]
(__glibcxx_assert): Rename to __glibcxx_assert_impl.
[_GLIBCXX_DEBUG] (__glibcxx_assert): Expand to __glibcxx_assert_impl.
* include/parallel/base.h [_GLIBCXX_PARALLEL_ASSERTIONS]
(_GLIBCXX_PARALLEL_ASSERT): Expand to __glibcxx_assert_impl.
[!_GLIBCXX_PARALLEL_ASSERTIONS] (_GLIBCXX_PARALLEL_ASSERT): Define as
empty.
* testsuite/25_algorithms/headers/algorithm/
parallel_algorithm_assert2.cc: New test.
From-SVN: r243434