Minor improvements in manual indexing.

	* doc/gdb.texinfo (Screen Size): Add more index entries.
Fix dwp to allow intermediate .dwp files with no .debug_types sections.

gold/
	* dwp.cc (Dwo_file::read): Allow files with no .debug_types
	sections.
	(Dwo_file::sized_read_unit_index): Likewise.
daily update