[PATCH,RS6000 5/5] Replace MASK_<xxxx> usage with OPTION_MASK_<xxxx>

[PATCH,RS6000 5/5] Replace MASK_<xxxx> usage with OPTION_MASK_<xxxx>

This continues the changes of replacing the MASK_<xxxx> defines
with their OPTION_MASK_<xxxx> equivalents.

This patch removes the defines for
MASK_P8_VECTOR, MASK_P9_VECTOR, MASK_P9_MISC, MASK_POPCNTB,
MASK_POPCNTD, MASK_PPC_GFXOPT, MASK_PPC_GPOPT, MASK_RECIP_PRECISION,
MASK_SOFT_FLOAT, MASK_VSX, MASK_POWER10, MASK_P10_FUSION.

gcc/
	* config/rs6000/aix71.h (MASK_PPC_GPOPT, MASK_PPC_GFXOPT): Replace with
	OPTION_MASK_PPC_GPOPT, OPTION_MASK_PPC_GFXOPT.
	* config/rs6000/darwin.h (MASK_PPC_GFXOPT): Replace with
	OPTION_MASK_PPC_GFXOPT.
	* config/rs6000/darwin64-biarch.h (MASK_PPC_GFXOPT): Same.
	* config/rs6000/default64.h (MASK_PPC_GPOPT, MASK_PPC_GFXOPT): Replace with
	OPTION_MASK_PPC_GPOPT, OPTION_MASK_PPC_GFXOPT.
	* config/rs6000/rs6000-c.cc: Update comment.
	* config/rs6000/rs6000-cpus.def: Update RS6000_CPU macro calls.
	* config/rs6000/rs6000.cc (rs6000_darwin_file_start): Replace
	MASK_PPC_GPOPT with OPTION_MASK_PPC_GPOPT.
	(rs6000_builtin_mask_names): Replace MASK_PPC_GFXOPT, MASK_POPCNTB
	with OPTION_MASK_PPC_GFXOPT, OPTION_MASK_POPCNTB.
	* config/rs6000/rs6000.h: (MASK_P8_VECTOR, MASK_P9_VECTOR,
	MASK_P9_MISC, MASK_POPCNTB, MASK_POPCNTD, MASK_PPC_GFXOPT,
	MASK_PPC_GPOPT, MASK_RECIP_PRECISION, MASK_SOFT_FLOAT,
	MASK_VSX, MASK_POWER10, MASK_P10_FUSION): Delete.