Remove datasize measurements based on sbrk()

Remove datasize measurements based on sbrk()

binutils/
	* nm.c (show_stats): Remove variable.
	(long_options): Remove --stats option.
	(main): Remove handling of --stats.

ld/
	* ldmain.c (main): Remove display of data size.

gas/
	* as.c (start_sbrk): Remove.
	(main): Remove assignment.
	(dump_statistics): Remove display of data size.