https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88273

GCC 8.2+ fails to build 32-bit PowerPC kernel due to this.

--- trunk/gcc/gimple-ssa-warn-restrict.c	2019/01/17 16:33:55	268037
+++ trunk/gcc/gimple-ssa-warn-restrict.c	2019/01/17 22:52:47	268048
@@ -319,13 +319,9 @@
 	  offrange[0] += offset_int::from (min, SIGNED);
 	  offrange[1] += offset_int::from (max, SIGNED);
 	}
-      else if (rng == VR_ANTI_RANGE)
-	{
-	  offrange[0] += offset_int::from (max + 1, SIGNED);
-	  offrange[1] += offset_int::from (min - 1, SIGNED);
-	}
       else
 	{
+	  /* Handle an anti-range the same as no range at all.  */
 	  gimple *stmt = SSA_NAME_DEF_STMT (offset);
 	  tree type;
 	  if (is_gimple_assign (stmt)