i386: Optimize generate insn for AVX10.2 compare

gcc/ChangeLog:

	* config/i386/i386-expand.cc (ix86_expand_fp_compare): Add UNSPEC to
	support the optimization.
	* config/i386/i386.cc (ix86_fp_compare_code_to_integer): Add NE/EQ.
	* config/i386/i386.md (*cmpx<unord><MODEF:mode>): New define_insn.
	(*cmpx<unord>hf): Ditto.
	* config/i386/predicates.md (ix86_trivial_fp_comparison_operator):
	Add ne/eq.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx10_2-compare-1b.c: New test.