* symfile.h (quick_symbol_functions): Delete member

	* symfile.h (quick_symbol_functions): Delete member
	pre_expand_symtabs_matching.  All uses removed.
	* dwarf2read.c (dw2_lookup_symbol): Implement.
	(dw2_do_expand_symtabs_matching): Delete.
	(dw2_pre_expand_symtabs_matching): Delete.
	(struct dw2_symtab_iterator): New type.
	(dw2_symtab_iter_init, dw2_symtab_iter_next): New functions.
	(dw2_expand_symtabs_for_function): Rewrite.
	(dwarf2_gdb_index_functions): Update.
	* psymtab.c (pre_expand_symtabs_matching_psymtabs): Delete.
	(psym_functions): Update.