re PR target/47822 (Multiple test suite failures due to revision 170321)

	PR target/47822
	* config/darwin-protos.h (darwin_init_cfstring_builtins): Return a
	tree so we can get save the type.
	* config/i386/darwin.h (SUBTARGET_INIT_BUILTINS): Reserve builtin slot
	for CFString instead of trying to use past the end of the builtins.
	* config/i386/i386.c (IX86_BUILTIN_CFSTRING): Likewise.
	* config/rs6000/rs6000-builtin.def (RS6000_BUILTIN_CFSTRING): Likewise.
	* config/rs6000/darwin.h (SUBTARGET_INIT_BUILTINS): Likewise.
	* config/darwin.c (DARWIN_BUILTIN_CFSTRINGMAKECONSTANTSTRING):
	Rename to darwin_builtin_cfstring.
	(darwin_init_cfstring_builtins): Return the built type.

From-SVN: r170376