pp.c: Replace SvUV_nomg(sv) with SvUVX(sv) in pp_int.

Similar to commit 7512287,
SvUV_nomg(sv) here can be safely replaced with simple SvUVX(sv)
as SvIOK(sv) and SvIsUV(sv) are already tested.

Author: t-a-k

pp.c

@@ -3318,7 +3318,7 @@ PP(pp_int)
       }
       else if (SvIOK(sv)) {
         if (SvIsUV(sv))
-            TARGu(SvUV_nomg(sv), 1);
+            TARGu(SvUVX(sv), 1);
         else
             TARGi(iv, 1);
       }