Reuse print_hex_chars function.

http://sourceware.org/ml/gdb-patches/2013-07/msg00234.html

	* infcmd.c (default_print_one_register_info): Reuse code in
	print_hex_chars.
	* uname.cc (uname): Drop unused code.
gold/
	* powerpc.cc (Target_powerpc::write_branch_lookup_table): Use
	correct BRLT entry size.
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