* buildsym.h (struct subfile): Add debugformat member.

	* buildsym.h (struct subfile): Add debugformat member.
	(record_debugformat): Declare global function.
	* buildsym.c (start_subfile): Initialize debugformat member
	to NULL.
	(record_debugformat): New function to record the format.
	(end_symtab): Copy format into symtab debugformat member.
	(end_symtab): Free subfile debugformat member.
	* symmisc.c (free_symtab): Free debugformat when freeing
	symtab.
	* symfile.c (allocate_symtab): Initialize the new debugformat
	member for new symtabs.
	* symtab.h (struct symtab): Add debugformat member.
	* source.c (source_info): Print the debug format.

	* os9kread.c (os9k_process_one_symbol): Call record_debugformat
	with "OS9".
	* hpread.c (hpread_expand_symtab): Call record_debugformat
	with "HP".
	(hpread_process_one_debug_symbol): Ditto.
	* dbxread.c (process_one_symbol): Call record_debugformat
	with "stabs".
	* coffread.c (coff_start_symtab): Call record_debugformat
	with "COFF".
	* xcoffread.c (read_xcoff_symtab): Call record_debugformat
	with "XCOFF".
	* dwarfread.c (read_file_scope): Call record_debugformat
	with "DWARF 1".
	* dwarf2read.c (read_file_scope): Call record_debugformat
	with "DWARF 2".
	* dstread.c (dst_end_symtab): Set debugformat to be
	"Apollo DST".
	* mdebugread.c (new_symtab): Set debugformat to be "ECOFF".