Fix ICE due to incorrect insn type.

Fix ICE due to incorrect insn type.

;; if reg/mem op
(define_insn_reservation  "slm_sseishft_3" 2
  (and (eq_attr "cpu" "slm")
       (and (eq_attr "type" "sseishft")
            (not (match_operand 2 "immediate_operand"))))
  "slm-complex, slm-all-eu")

in slm.md it will check operands[2] for type sseishft, but for
extendbfsf2_1 there's no second operand which caused ICE.
The patch set type from sseishft to sseishft1 to fix the issue.

gcc/ChangeLog:

	PR target/107934
	* config/i386/i386.md (extendbfsf2_1): Change type from
	sseishft to sseishft1.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr107934.c: New test.