re PR target/80210 (ICE in in extract_insn, at recog.c:2311 on ppc64 for with __built...

re PR target/80210 (ICE in in extract_insn, at recog.c:2311 on ppc64 for with __builtin_pow)

gcc/
	PR target/80210
	* config/rs6000/rs6000.c (rs6000_option_override_internal): Rewrite
	function to not use the have_cpu variable.  Do not set cpu_index,
	rs6000_cpu_index or rs6000_tune_index if we end up using TARGET_DEFAULT
	or the default cpu.
	(rs6000_valid_attribute_p): Remove duplicate initializations of
	old_optimize and func_optimize.
	(rs6000_pragma_target_parse): Call rs6000_activate_target_options ().
	(rs6000_activate_target_options): Make global.
	* config/rs6000/rs6000-protos.h (rs6000_activate_target_options): Add
	prototype.

gcc/testsuite/
	PR target/80210
	* gcc.target/powerpc/pr80210-2.c: New test.

From-SVN: r253358