[PATCH] Fix PR81573 testcase

[Richard Biener]

Tested on x86_64-unknown-linux-gnu, applied.

Richard.

2017-07-28  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/81573
        * gcc.dg/torture/pr81573.c: Explicitely use signed char.

Index: gcc/testsuite/gcc.dg/torture/pr81573.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr81573.c      (revision 250649)
+++ gcc/testsuite/gcc.dg/torture/pr81573.c      (working copy)
@@ -1,7 +1,7 @@
 /* { dg-do run } */
 
 int a = 1, *c = &a, d;
-char b;
+signed char b;
 
 int main ()
 {