This is also an update to this patch based on reviews of earlier patches.

One additional hunk (mentioned below) was added to tests for when glibc 
debuginfo is installed.

Keith

Changes since last version:
   - use make_cleanup_delete_event_location
   - string_to_explicit_location remove SAVE_SPEC
   - Add additional completion test pattern for when glibc debuginfo
     installed

ChangeLog
2014-05-29  Keith Seitz  <keiths@redhat.com>

	* completer.c: Include location.h.
	(enum match_type): New enum.
	(location_completer): Rename to ...
	(linespec_completer): ... this.
	(collect_explicit_location_matches): New function.
	(explicit_location_completer): New function.
	(location_completer): "New" function; handle linespec
	and explicit location completions.
	(complete_line_internal): Remove all location completer-specific
	handling.
	* linespec.c (linespec_lexer_lex_keyword): Export.
	(is_ada_operator): Ditto.
	(find_toplevel_char): Ditto.
	(linespec_parse_line_offset): Ditto.
	Issue error if STRING is not numerical.
	(gdb_get_linespec_parser_quote_characters): New function.
	* linespec.h (linespec_parse_line_offset): Declare.
	(location_completer): Declare.
	(get_gdb_linespec_parser_quote_characters): Declare.
	(is_ada_operator): Declare.
	(find_toplevel_char): Declare.
	* location.c (explicit_to_event_location): New function.
	(explicit_location_lex_one): New function.
	(string_to_explicit_location): New function.
	(string_to_event_location): Handle explicit locations.
	* location.h (explicit_to_event_location): Declare.
	(string_to_explicit_location): Declare.

testsuite/ChangeLog
2014-05-29  Keith Seitz  <keiths@redhat.com>

	* gdb.base/save-bp.exp: Add tests for address locations
	and explicit locations, pending and not-pending, with and
	without conditions, including resolved pending breakpoints.
	* gdb.linespec/3explicit.c: New file.
	* gdb.linespec/cpexplicit.cc: New file.
	* gdb.linespec/cpexplicit.exp: New file.
	* gdb.linespec/explicit.c: New file.
	* gdb.linespec/explicit.exp: New file.
	* gdb.linespec/explicit2.c: New file.
	* gdb.linespec/ls-errs.exp: Add explicit location tests.