sparc64: fix udiv and sdiv insns

- truncate second operand to 32bit
Signed-off-by: NIgor V. Kovalenko <igor.v.kovalenko@gmail.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

target-sparc/op_helper.c

@@ -3306,7 +3306,7 @@ target_ulong helper_udiv(target_ulong a, target_ulong b)
     uint32_t x1;
 
     x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
-    x1 = b;
+    x1 = (b & 0xffffffff);
 
     if (x1 == 0) {
         raise_exception(TT_DIV_ZERO);
@@ -3328,7 +3328,7 @@ target_ulong helper_sdiv(target_ulong a, target_ulong b)
     int32_t x1;
 
     x0 = (a & 0xffffffff) | ((int64_t) (env->y) << 32);
-    x1 = b;
+    x1 = (b & 0xffffffff);
 
     if (x1 == 0) {
         raise_exception(TT_DIV_ZERO);