* symtab.c (find_pc_line, find_line_common),

	* symtab.c (find_pc_line, find_line_common),
	symtab.h (struct linetable), xcoffread.c (arrange_linetable):
	Revise comments re linetable sorting.
	* buildsym.c (compare_line_numbers): Sort by pc, not by line.
	* coffread.c: Tell end_symtab to sort the line table.

	* coffread.c: Re-work a lot of the coff-specific stuff to use stuff
	in buildsym.c.  This includes coff_finish_block, coff_context_stack,
	coff_local_symbols, coff_file_symbols, coff_global_symbols,
	coff_end_symtab and coff_add_symbol_to_list.
	(read_enum_type): Deal with it now that we have a "struct pending"
	not a "struct coff_pending".

	* buildsym.c (end_symtab): Don't realloc subfile->linetable.