Emit a warning when AVX10 options conflict in vector width

Emit a warning when AVX10 options conflict in vector width

gcc/ChangeLog:

	* common/config/i386/i386-common.cc
	(ix86_check_avx10_vector_width): New function to check isa_flags
	to emit a warning when there is a conflict in AVX10 options for
	vector width.
	(ix86_handle_option): Add check for avx10.1-256 and avx10.1-512.
	* config/i386/driver-i386.cc (host_detect_local_cpu):
	Do not append -mno-avx10-max-512bit for -march=native.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx10_1-15.c: New test.
	* gcc.target/i386/avx10_1-16.c: Ditto.
	* gcc.target/i386/avx10_1-17.c: Ditto.
	* gcc.target/i386/avx10_1-18.c: Ditto.