rs6000: Remove TARGET_E500_{SINGLE,DOUBLE}

rs6000: Remove TARGET_E500_{SINGLE,DOUBLE}

TARGET_E500_{SINGLE,DOUBLE} is always false now.

	* config/rs6000/predicates.md: Replace TARGET_E500_DOUBLE and
	TARGET_E500_SINGLE by 0, simplify.
	* config/rs6000/rs6000.c: Ditto.
	(rs6000_option_override_internal): Delete CHECK_E500_OPTIONS.
	(spe_build_register_parallel): Delete.
	* config/rs6000/rs6000.h: Delete TARGET_E500_SINGLE,
	TARGET_E500_DOUBLE, and CHECK_E500_OPTIONS.
	* config/rs6000/rs6000.md: Replace TARGET_E500_DOUBLE,
	TARGET_E500_SINGLE, and <E500_CONVERT> by 0, simplify.
	(E500_CONVERT): Delete.
	* config/rs6000/spe.md: Remove many patterns and all define_constants.

From-SVN: r248975