i386: Fix invalid RTX mode in the unnamed rotate splitter.

i386: Fix invalid RTX mode in the unnamed rotate splitter.

The following splitter from the commit r11-5747:

(define_split
  [(set (match_operand:SWI 0 "register_operand")
        (any_rotate:SWI
          (match_operand:SWI 1 "const_int_operand")
          (subreg:QI
            (and
              (match_operand 2 "int248_register_operand")
              (match_operand 3 "const_int_operand")) 0)))]
 "(INTVAL (operands[3]) & (GET_MODE_BITSIZE (<MODE>mode) - 1))
   == GET_MODE_BITSIZE (<MODE>mode) - 1"
 [(set (match_dup 4) (match_dup 1))
  (set (match_dup 0)
       (any_rotate:SWI (match_dup 4)
                       (subreg:QI
                         (and:SI (match_dup 2) (match_dup 3)) 0)))]
 "operands[4] = gen_reg_rtx (<MODE>mode);")

matches any mode of (and ...) on input, but hard-codes (and:SI ...)
in the output.  This causes an ICE if the incoming (and ...) is DImode
rather than SImode.

Co-developed-by: Richard Sandiford <richard.sandiford@arm.com>
	PR target/96226

gcc/ChangeLog:

	* config/i386/predicates.md (and_operator): New operator.
	* config/i386/i386.md (splitter after *<rotate_insn><mode>3_mask):
	Use and_operator to match AND RTX and use its mode
	in the split pattern.