re PR target/10901 (non-local goto's don't work on darwin)

re PR target/10901 (non-local goto's don't work on darwin)

gcc:

	PR target/10901
	* config/darwin-protos.h (machopic_get_function_picbase): New.
	* config/darwin.c (machopic_get_function_picbase): New.
	* config/rs6000/darwin.md (load_macho_picbase_si): Update picbase
	label for a new func.  (load_macho_picbase_di): Likewise.
	(reload_macho_picbase): New expand.
	(reload_macho_picbase_si): New insn.
	(reload_macho_picbase_di): New insn.
	(nonlocal_goto_receiver): New define and split.
	* config/rs6000/rs6000.md (unspec enum): Add UNSPEC_RELD_MPIC.
	(unspecv enum): Add UNSPECV_NLGR.

From-SVN: r203019