c-common.c (self_promoting_args_p): Change the return type to bool.

	* c-common.c (self_promoting_args_p): Change the return type to bool.
	Use false/true instead of 0/1.
	* c-common.h (self_promoting_args_p): Update.

	* c-decl.c (start_decl): Use false/true instead of 0/1.
	(grokdeclarator): Likewise.
	(finish_struct): Likewise.
	(start_function): Change the return type to bool.  Use false/true
	instead of 0/1.
	(declspecs_add_qual): Use UNKNOWN_LOCATION instead of 0.
	* c-tree.h (start_function): Update.
	* c-typeck.c (same_translation_unit_p): Change the return type to bool.
	(set_designator): Change the return type to bool.  Use false/true
	instead of 0/1.

From-SVN: r248192