rs6000: Delete -mmfpgpr

rs6000: Delete -mmfpgpr

This patch makes the -mmfpgpr option not do anything except warn that
the option is deprecated.

	* config/rs6000/rs6000.h (MASK_MFPGPR): Delete.
	* config/rs6000/rs6000.c (direct_move_p): Adjust.
	(rs6000_secondary_reload_simple_move): Adjust.
	(rs6000_opt_masks): Neuter the "mfpgpr" option.
	* config/rs6000/rs6000-c.c (rs6000_target_modify_macros): Adjust.
	* config/rs6000/rs6000-cpus.def (ISA_2_5_MASKS_EMBEDDED): Adjust
	comment.
	(power6x): Adjust.
	* config/rs6000/rs6000.md (floatsi<mode>2_lfiwax): Adjust.
	(floatunssi<mode>2_lfiwzx): Adjust.
	(fix_trunc<mode>si2_stfiwx): Adjust.
	(fixuns_trunc<mode>si2_stfiwx): Adjust.
	* config/rs6000/rs6000.opt (mno-mfpgpr): New.
	(mfpgpr): Mark as deprecated.
	* doc/extend.texi (PowerPC Function Attributes): Delete mfpgpr.
	(Basic PowerPC Built-in Functions Available on ISA 2.05): Adjust.
	* doc/invoke.texi (RS/6000 and PowerPC Options): Delete -mmfpgpr.

gcc/testsuite/
	* gcc.target/powerpc/mmfpgpr.c: Delete.

From-SVN: r271889