Revert patch.

Revert patch.

gcc/
2021-06-10  Michael Meissner  <meissner@linux.ibm.com>

	Revert patch.
	PR target/101019
	* config/rs6000/rs6000-cpus.def (ISA_3_1_MASKS_SERVER): Add
	-mpower10-large-consts support.
	(POWERPC_MASKS): Add -mpower10-large-consts support.
	* config/rs6000/rs6000.c (rs6000_option_override_internal): Add
	-mpower10-large-consts support.
	(num_insns_constant_gpr): Add -mpower10-large-consts support.
	(rs6000_emit_set_long_const): Add -mpower10-large-consts support.
	(rs6000_opt_masks): Add -mpower10-large-consts.
	* config/rs6000/rs6000.opt (-mpower10-large-consts): New switch.

gcc/testsuite/
2021-06-09  Michael Meissner  <meissner@linux.ibm.com>

	Revert patch.
	PR target/101019
	* gcc.target/powerpc/prefix-large-const.c: New test.