Add new option -ggnu-pubnames.

Add new option -ggnu-pubnames.

2013-10-22  Sterling Augustine  <saugustine@google.com>

	* doc/invoke.texi: Document -ggnu-pubnames.
	* common.opt: Add new option -ggnu-pubnames and modify -gpubnames
	logic.
	* dwarf2out.c: Include gdb/gdb-index.h.
	(DEBUG_PUBNAMES_SECTION, DEBUG_PUBTYPES_SECTION): Handle
	debug_generate_pub_sections.
	(is_java, output_pubtables, output_pubname): New functions.
	(include_pubname_in_output): Handle debug_generate_pub_sections at
	level 2.
	(size_of_pubnames): Use new local space_for_flags based on
	debug_generate_pub_sections.
	(output_pubnames): Unify pubnames and pubtypes output logic.
	Genericize comments.  Call output_pubname.
	(dwarf2out_finish): Move logic to output_pubnames and call it.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@203936 138bc75d-0d04-0410-961f-82ee72b054a4