PR target/105930: Split *xordi3_doubleword after reload on x86.

PR target/105930: Split *xordi3_doubleword after reload on x86.

This is a backport of the fix for PR target/105930 from mainline to the
gcc12 release branch.

2022-07-09  Roger Sayle  <roger@nextmovesoftware.com>
	    Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog
	PR target/105930
	* config/i386/i386.md (*<any_or>di3_doubleword): Split after
	reload.  Use rtx_equal_p to avoid creating memory-to-memory moves,
	and emit NOTE_INSN_DELETED if operand[2] is zero (i.e. with -O0).