Kernels loops annotation: Fortran.

Kernels loops annotation: Fortran.

This patch implements the Fortran support for adding "#pragma acc loop auto"
annotations to loops in OpenACC kernels regions.  It implements the same
-fopenacc-kernels-annotate-loops and -Wopenacc-kernels-annotate-loops options
that were previously added (and documented) for the C/C++ front ends.

2020-03-27  Sandra Loosemore  <sandra@codesourcery.com>
	    Gergö Barany <gergo@codesourcery.com>

	gcc/fortran/
	* gfortran.h (gfc_oacc_annotate_loops_in_kernels_regions): Declare.
	* lang.opt (Wopenacc-kernels-annotate-loops): New.
	(fopenacc-kernels-annotate-loops): New.
	* openmp.cc: Include options.h.
	(enum annotation_state, enum annotation_result): New.
	(check_code_for_invalid_calls): New.
	(check_expr_for_invalid_calls): New.
	(check_for_invalid_calls): New.
	(annotate_do_loop): New.
	(annotate_do_loops_in_kernels): New.
	(compute_goto_targets): New.
	(gfc_oacc_annotate_loops_in_kernels_regions): New.
	* parse.cc (gfc_parse_file): Handle -fopenacc-kernels-annotate-loops.

	gcc/testsuite/
	* gfortran.dg/goacc/classify-kernels-unparallelized.f95: Add
	-fno-openacc-kernels-annotate-loops option.
	* gfortran.dg/goacc/classify-kernels.f95: Likewise.
	* gfortran.dg/goacc/common-block-3.f90: Likewise.
	* gfortran.dg/goacc/kernels-loop-2.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-2.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-enter-exit-2.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-enter-exit.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-update.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-n.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop.f95: Likewise.
	* gfortran.dg/goacc/kernels-parallel-loop-data-enter-exit.f95:
	Likewise.
	* gfortran.dg/goacc/kernels-loop-annotation-1.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-2.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-3.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-4.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-5.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-6.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-7.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-8.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-9.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-10.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-11.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-12.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-13.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-14.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-15.f95: New.
	* gfortran.dg/goacc/kernels-loop-annotation-16.f95: New.