libstdc++/71856 Define _GLIBCXX_PARALLEL_ASSERTIONS
PR libstdc++/71856
* include/bits/c++config (_GLIBCXX_ASSERTIONS): Define to 1 not empty.
* include/parallel/compiletime_settings.h (_GLIBCXX_ASSERTIONS):
Rename to _GLIBCXX_PARALLEL_ASSERTIONS and make default value depend
on _GLIBCXX_ASSERTIONS.
* include/parallel/balanced_quicksort.h: Rename _GLIBCXX_ASSERTIONS.
Include <unistd.h> for sleep.
* include/parallel/losertree.h: Rename _GLIBCXX_ASSERTIONS.
* include/parallel/merge.h: Likewise.
* include/parallel/multiway_merge.h: Likewise.
* include/parallel/partition.h: Likewise.
* include/parallel/queue.h: Likewise.
* include/parallel/sort.h: Likewise.
* testsuite/25_algorithms/headers/algorithm/
parallel_algorithm_assert.cc: New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@238307 138bc75d-0d04-0410-961f-82ee72b054a4