[binutils-gdb] Inline command_loop in read_command_line

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT faa4ebe148cfe83f06d881cfc80d95575d3bf746 ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: faa4ebe148cfe83f06d881cfc80d95575d3bf746

Inline command_loop in read_command_line

read_command_line is the only caller, and here we can assume we're
reading a regular file, not stdin.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

	* top.c (read_command_file): Inline command_loop here.
	(command_loop): Delete.