Fix ICE of unrecognizable insn. [PR target/104001]

Fix ICE of unrecognizable insn. [PR target/104001]

For define_insn_and_split "*xor2andn":

1. Refine predicate of operands[0] from nonimmediate_operand to
register_operand.
2. Remove TARGET_AVX512BW from condition to avoid kmov when TARGET_BMI
is not available.

gcc/ChangeLog:

	PR target/104001
	PR target/94790
	PR target/104014
	* config/i386/i386.md (*xor2andn): Refine predicate of
	operands[0] from nonimmediate_operand to
	register_operand, remove TARGET_AVX512BW from condition.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr104001.c: New test.