[SH, committed] Fix a warning in sh.md

[Oleg Endo]

Hello,

This fixes a warning in sh.md caused by a missing mode in the
doloop_end_split pattern.
Tested with
 make -k check RUNTESTFLAGS="--target_board=sh-sim
\{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}"

with no new failures.  Committed as obvious as rev 205359.

Cheers,
Oleg

gcc/ChangeLog:
        * config/sh/sh.md (doloop_end_split): Add missing SI mode.

Index: gcc/config/sh/sh.md
===================================================================
--- gcc/config/sh/sh.md	(revision 205190)
+++ gcc/config/sh/sh.md	(working copy)
@@ -8801,7 +8801,7 @@
 		      (label_ref (match_operand 1 "" ""))
 		      (pc)))
    (set (match_operand:SI 0 "arith_reg_dest" "=r")
-	(plus (match_dup 2) (const_int -1)))
+	(plus:SI (match_dup 2) (const_int -1)))
    (clobber (reg:SI T_REG))]
   "TARGET_SH2"
   "#"