tree-vrp.c (compare_assert_loc): Fix comparison function to return predictable results.

2017-07-17  Yury Gribov  <tetra2005@gmail.com>

gcc/
        * tree-vrp.c (compare_assert_loc): Fix comparison function
	to return predictable results.

From-SVN: r250278

gcc/ChangeLog

+2017-07-17  Yury Gribov  <tetra2005@gmail.com>
+
+        * tree-vrp.c (compare_assert_loc): Fix comparison function
+	to return predictable results.
+
 2017-07-17  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* config/arc/arc.md (adddi3): Remove support for mexpand-adddi

gcc/tree-vrp.c

@@ -6459,7 +6459,7 @@ compare_assert_loc (const void *pa, const void *pb)
     return (a->e != NULL
 	    ? a->e->src->index - b->e->src->index
 	    : a->bb->index - b->bb->index);
-  return ha - hb;
+  return ha > hb ? 1 : -1;
 }
 
 /* Process all the insertions registered for every name N_i registered