re PR target/66954 (function multiversioning fails for target "aes")

re PR target/66954 (function multiversioning fails for target "aes")

libgcc/ChangeLog:

	PR target/66954
	* config/i386/cpuinfo.c (enum processor_features): Add FEATURE_PCLMUL.
	(get_available_features): Handle FEATURE_PCLMUL.

gcc/ChangeLog:

	PR target/66954
	* config/i386/i386.c (get_builtin_code_for_version): Add P_PCLMUL
	to enum feature_priority and feature_list.
	(fold_builtin_cpu): Add F_PCLMUL to enum processor_features
	and isa_names_table.

gcc/testsuite/ChangeLog:

	PR target/66954
	* g++.dg/ext/mv25.C: New test.

From-SVN: r226784