[Fortran] OpenMP - permit lastprivate in distribute + SIMD fixes (PR94690)

[Fortran] OpenMP - permit lastprivate in distribute + SIMD fixes (PR94690)

gcc/fortran/
2020-05-13  Tobias Burnus  <tobias@codesourcery.com>

	PR fortran/94690
        * openmp.c (OMP_DISTRIBUTE_CLAUSES): Add OMP_CLAUSE_LASTPRIVATE.
        (gfc_resolve_do_iterator): Skip the private handling for SIMD as
        that is handled by ME code.
	* trans-openmp.c (gfc_trans_omp_do): Don't add private/lastprivate
	for dovar_found == 0, unless !simple.

libgomp/
2020-05-13  Tobias Burnus  <tobias@codesourcery.com>

	PR fortran/94690
	* testsuite/libgomp.fortran/pr66199-3.f90: New.
	* testsuite/libgomp.fortran/pr66199-4.f90: New.
	* testsuite/libgomp.fortran/pr66199-5.f90: New.
	* testsuite/libgomp.fortran/pr66199-6.f90: New.
	* testsuite/libgomp.fortran/pr66199-7.f90: New.
	* testsuite/libgomp.fortran/pr66199-8.f90: New.
	* testsuite/libgomp.fortran/pr66199-9.f90: New.