Use signed char in a test (PR testsuite/87739).

2018-10-25  Martin Liska  <mliska@suse.cz>

	PR testsuite/87739
	* gcc.dg/tree-ssa/pr84436-5.c (foo): Use signed char.

From-SVN: r265495

gcc/testsuite/ChangeLog

 2018-10-25  Martin Liska  <mliska@suse.cz>
 
+	PR testsuite/87739
+	* gcc.dg/tree-ssa/pr84436-5.c (foo): Use signed char.
+
+2018-10-25  Martin Liska  <mliska@suse.cz>
+
 	PR other/87735
 	* gcc.dg/tree-prof/time-profiler-1.c: Revert.
 	* gcc.dg/tree-prof/time-profiler-2.c: Likewise.

gcc/testsuite/gcc.dg/tree-ssa/pr84436-5.c

@@ -2,9 +2,9 @@
 /* { dg-options "-O2 -fdump-tree-switchconv -fdump-tree-optimized" } */
 /* { dg-do run } */
 
-char
+signed char
 __attribute__ ((noipa))
-foo (char how)
+foo (signed char how)
 {
   switch (how) {
     case -4: how = 96; break;