PR libstdc++/83134 Ensure std::__not_ converts B::value to bool
PR libstdc++/83134
* include/std/type_traits (__not_): Explicitly convert to bool.
* testsuite/20_util/declval/requirements/1_neg.cc: Adjust dg-error.
* testsuite/20_util/logical_traits/83134.cc: New test.
* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Adjust
dg-error.
* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@255122 138bc75d-0d04-0410-961f-82ee72b054a4