lto-symtab.c (lto_symtab_merge): Use gtc_mode enum values.

2010-07-23  Richard Guenther  <rguenther@suse.de>

	* lto-symtab.c (lto_symtab_merge): Use gtc_mode enum
	values.
	(lto_symtab_merge_decls_2): Likewise.
	* tree-ssa.c (useless_type_conversion_p): Likewise.
	* lto-streamer-in.c (input_gimple_stmt): Likewise.
	* gimple.c (gtc_visited2, gtc_ob2): Remove.
	(struct type_pair_d): Make same_p an array indexed by mode.
	Update comment.
	(lookup_type_pair): Update initialization.
	(struct sccs): Adjust same_p type.
	(gimple_types_compatible_p_1, gtc_visit, gimple_types_compatible_p):
	Adjust.
	(print_gimple_types_stats): Likewise.
	* gimple.h (enum gtc_mode): New.
	(gimple_types_compatible_p): Adjust prototype.

From-SVN: r162461