(COMMON_OBS): Add target-memory.o.
* memattr.c (lookup_mem_region): Adjust handling for
the top of memory. Improve comments.
* remote.c (packet_check_result): New function, split out
from packet_ok. Recognize "E." as an error prefix.
(packet_ok): Use it.
(remote_write_bytes_aux): New function, renamed from
remote_write_bytes. Take packet header, packet format,
and length flag as arguments.
(remote_write_bytes): Rewrite to use remote_write_bytes_aux.
(remote_send_printf, restore_remote_timeout)
(remote_flash_timeout, remote_flash_erase, remote_flash_write)
(remote_flash_done): New.
(remote_xfer_partial): Handle flash writes.
(init_remote_ops, init_remote_async_ops): Set to_flash_erase
and to_flash_done.
* symfile.c (struct load_section_data): Include a pointer to
the cumulative stats and a request queue. Move most members
to other types.
(struct load_progress_data, struct load_progress_section_data): New
types.
(load_progress): Handle a NULL baton and zero bytes. Update for
type changes.
(load_section_callback): Create memory write requests instead of
writing to memory. Don't print the progress message here.
(clear_memory_write_data): New function.
(generic_load): Use target_write_memory_blocks.
* target-memory.c: New file.
* target.c (update_current_target): Mention new uninherited methods.
(memory_xfer_partial): Issue an error for flash writes.
(target_flash_erase, target_flash_done): New functions.
(target_write_with_progress): Call the progress callback at the
start also.
* target.h (enum target_object): Add TARGET_OBJECT_FLASH.
(target_write_with_progress): Update comment.
(struct target_ops): Add to_flash_erase and to_flash_done.
(target_flash_erase, target_flash_done, struct memory_write_request)
(memory_write_request_s, enum flash_preserve_mode)
(target_write_memory_blocks): New, including a vector type
for memory_write_request_s.
