Move offload data into GPU memory.

Move offload data into GPU memory.

2019-09-09  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* config/gcn/gcn-run.c (heap_region): New global variable.
	(struct hsa_runtime_fn_info): Add hsa_memory_assign_agent_fn.
	(init_hsa_runtime_functions): Initialize hsa_memory_assign_agent.
	(get_kernarg_region): Move contents to ....
	(get_memory_region): .... here.
	(get_heap_region): New function.
	(init_device): Initialize the heap_region.
	(device_malloc): Add region parameter.
	(struct kernargs): Move heap ....
	(heap): ... to global scope.
	(main): Allocate heap separate to kernargs.

	libgomp/
	* plugin/plugin-gcn.c (struct hsa_runtime_fn_info): Add
	hsa_memory_assign_agent_fn.
	(struct agent_info): Add data_region.
	(init_hsa_runtime_functions): Initialize hsa_memory_assign_agent.
	(get_kernarg_memory_region): Move contents to new function ...
	(get_memory_region): ... here.
	(get_data_memory_region): New function.
	(GOMP_OFFLOAD_get_property): Use data_region, not kernarg_region.
	(GOMP_OFFLOAD_init_device): Initialize data_region.
	(create_and_finalize_hsa_program): Use data_region, not
	kernarg_region, and assign heap to device agent.
	(GOMP_OFFLOAD_alloc_by_agent): Likewise.
	(image_address_p): Delete function.
	(struct copy_data): Remove use_hsa_memory_copy.
	(copy_data): Always use hsa_memory_copy.
	(queue_push_copy): Remove use_hsa_memory_copy.
	(GOMP_OFFLOAD_dev2host): Always use hsa_memory_copy.
	(GOMP_OFFLOAD_host2dev): Likewise.
	(GOMP_OFFLOAD_dev2dev): Likewise.
	(gcn_exec): Use hsa_memory_copy.
	(GOMP_OFFLOAD_openacc_async_host2dev): Always use hsa_memory_copy.
	(GOMP_OFFLOAD_openacc_async_dev2host): Likewise.

(cherry picked from openacc-gcc-9-branch commit
cd5b623df8eccfdf81930414765e2c1f1ecaab9a)