Rename acc_device_gcn to acc_device_radeon

Rename acc_device_gcn to acc_device_radeon

2020-01-17  Andrew Stubbs  <ams@codesourcery.com>

	libgomp/
	* config/accel/openacc.f90 (openacc_kinds): Rename acc_device_gcn to
	acc_device_radeon.
	(openacc): Likewise.
	* openacc.f90 (openacc_kinds): Likewise.
	(openacc): Likewise.
	* openacc.h (acc_device_t): Likewise.
	* openacc_lib.h: Likewise.
	* testsuite/lib/libgomp.exp
	(check_effective_target_openacc_amdgcn_accel_present): Likewise.
	* testsuite/libgomp.oacc-c-c++-common/acc_prof-init-1.c
	(cb_compute_construct_end): Likewise.
	* testsuite/libgomp.oacc-c-c++-common/acc_prof-kernels-1.c
	(cb_enqueue_launch_start): Likewise.
	* testsuite/libgomp.oacc-c-c++-common/acc_prof-parallel-1.c
	(cb_enter_data_end): Likewise.
	(cb_exit_data_start): Likewise.
	(cb_exit_data_end): Likewise.
	(cb_compute_construct_end): Likewise.
	(cb_enqueue_launch_start): Likewise.
	(cb_enqueue_launch_end): Likewise.
	* testsuite/libgomp.oacc-c-c++-common/asyncwait-nop-1.c
	(main): Likewise.