Fix bogus operand predicate on iq2000

The iq2000-elf port regressed these tests recently:

> iq2000-sim: gcc.c-torture/execute/20040703-1.c   -O2  (test for excess errors)
> iq2000-sim: gcc.c-torture/execute/20040703-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
> iq2000-sim: gcc.c-torture/execute/20040703-1.c   -O3 -g  (test for excess errors)

It turns out one of the patterns had an operand predicate that allowed REG,
SUBREG, CONST_INT (with a limited set of CONST_INTs).  Yet the constraint only
allowed the limited set of immediates.  This naturally triggered an LRA
constraint failure.

The fix is trivial, create an operand predicate that accurately reflects the
kinds of operands allowed by the instruction.

It turns out this was a long standing bug -- fixing the pattern resolved 55
failing tests in the testsuite.

gcc/
	* config/iq2000/predicates.md (uns_arith_constant): New predicate.
	* config/iq2000/iq2000.md (rotrsi3): Use it.

gcc/config/iq2000/iq2000.md

@@ -988,7 +988,7 @@
 (define_insn "rotrsi3"
   [(set (match_operand:SI 0 "register_operand" "=r")
         (rotatert:SI (match_operand:SI 1 "register_operand" "r")
-                     (match_operand:SI 2 "uns_arith_operand" "O")))]
+                     (match_operand:SI 2 "uns_arith_constant" "O")))]
   ""
   "ram %0,%1,%2,0x0,0x0"
   [(set_attr "type" "arith")])

gcc/config/iq2000/predicates.md

@@ -17,6 +17,15 @@
 ;; along with GCC; see the file COPYING3.  If not see
 ;; <http://www.gnu.org/licenses/>.
 
+;; Return 1 if OP can be used as an operand where a 16-bit
+;; unsigned integer is needed.
+
+(define_predicate "uns_arith_constant"
+  (match_code "const_int")
+{
+  return SMALL_INT_UNSIGNED (op);
+})
+
 ;; Return 1 if OP can be used as an operand where a register or 16-bit
 ;; unsigned integer is needed.