[binutils-gdb] Code cleanup: dwarf2read.c: Add data_buf::append_uint

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT c2f134ac418eafca850e7095d789a01ec1142fc4 ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: c2f134ac418eafca850e7095d789a01ec1142fc4

Code cleanup: dwarf2read.c: Add data_buf::append_uint

This avoids having to specify the integer size twice in the same line.

gdb/ChangeLog:
2017-06-12  Pedro Alves  <palves@redhat.com>

	* dwarf2read.c (data_buf::append_space): Rename to...
	(data_buf::grow): ... this, and make private.  Adjust all callers.
	(data_buf::append_uint): New method.
	(add_address_entry, write_one_signatured_type)
	(write_psymtabs_to_index): Use it.