openmp: c++: Consider typeinfo decls to be predetermined shared [PR91118]

openmp: c++: Consider typeinfo decls to be predetermined shared [PR91118]

If the typeinfo decls appear in OpenMP default(none) regions, as we no longer
predetermine const with no mutable members, they are diagnosed as errors,
but it isn't something the users can actually provide explicit sharing for in
the clauses.

2020-01-29  Jakub Jelinek  <jakub@redhat.com>

	PR c++/91118
	* cp-gimplify.c (cxx_omp_predetermined_sharing): Return
	OMP_CLAUSE_DEFAULT_SHARED for typeinfo decls.

	* g++.dg/gomp/pr91118-1.C: New test.
	* g++.dg/gomp/pr91118-2.C: New test.