A few more tests that use hardcoded dg-error line numbers, but could
use implied ones.
* testsuite/19_diagnostics/error_code/operators/bool_neg.cc: Move
dg-error to relevant line.
* testsuite/19_diagnostics/error_condition/operators/bool_neg.cc:
Likewise.
*
I'm moving { dg-error "..." "" { target *-*-* } NN } to line NN so it
can just be { dg-error "..." } with an implied line number. That makes
the tests less fragile if the test changes and the line moves.
* testsuite/20_util/duration/requirements/typedefs_neg3.cc: Move
dg-error to
