Add OpenACC Fortran support for deviceptr and variable in common blocks

Add OpenACC Fortran support for deviceptr and variable in common blocks

2018-06-29  Cesar Philippidis  <cesar@codesourcery.com>
	    James Norris  <jnorris@codesourcery.com>

	gcc/fortran/
	* openmp.c (gfc_match_omp_map_clause): Re-write handling of the
	deviceptr clause.  Add new common_blocks argument.  Propagate it to
	gfc_match_omp_variable_list.
	(gfc_match_omp_clauses): Update calls to gfc_match_omp_map_clauses.
	(resolve_positive_int_expr): Promote the warning to an error.
	(check_array_not_assumed): Remove pointer check.
	(resolve_oacc_nested_loops): Error on do concurrent loops.
	* trans-openmp.c (gfc_omp_finish_clause): Don't create pointer data
	mappings for deviceptr clauses.
	(gfc_trans_omp_clauses): Likewise.

	gcc/
	* gimplify.c (enum gimplify_omp_var_data): Add GOVD_DEVICETPR.
	(oacc_default_clause): Privatize fortran common blocks.
	(omp_notice_variable): Add GOVD_DEVICEPTR attribute when appropriate.
	Defer the expansion of DECL_VALUE_EXPR for common block decls.
	(gimplify_scan_omp_clauses): Add GOVD_DEVICEPTR attribute when
	appropriate.
	(gimplify_adjust_omp_clauses_1): Set GOMP_MAP_FORCE_DEVICEPTR for
	implicit deviceptr mappings.

	gcc/testsuite/
	* c-c++-common/goacc/deviceptr-4.c: Update.
	* gfortran.dg/goacc/common-block-1.f90: New test.
	* gfortran.dg/goacc/common-block-2.f90: New test.
	* gfortran.dg/goacc/loop-2.f95: Update.
	* gfortran.dg/goacc/loop-3-2.f95: Update.
	* gfortran.dg/goacc/loop-3.f95: Update.
	* gfortran.dg/goacc/loop-5.f95: Update.
	* gfortran.dg/goacc/pr72715.f90: New test.
	* gfortran.dg/goacc/sie.f95: Update.
	* gfortran.dg/goacc/tile-1.f90: Update.
	* gfortran.dg/gomp/pr77516.f90: Update.

	libgomp/
	* oacc-parallel.c (GOACC_parallel_keyed): Handle Fortran deviceptr
	clause.
	(GOACC_data_start): Likewise.
	* testsuite/libgomp.oacc-fortran/common-block-1.f90: New test.
	* testsuite/libgomp.oacc-fortran/common-block-2.f90: New test.
	* testsuite/libgomp.oacc-fortran/common-block-3.f90: New test.
	* testsuite/libgomp.oacc-fortran/deviceptr-1.f90: New test.

(cherry picked from openacc-gcc-9-branch commit
ac6c90812344f4f4cfe4d2f5901c1a9d038a4000)