pr65947-9.c: Requires char to be signed by default.

Fails on S/390 with char defaulting to unsigned char.

gcc/testsuite/ChangeLog:

2017-09-27  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* gcc.dg/vect/pr65947-9.c: Use signed char explicitly.

From-SVN: r253224

gcc/testsuite/ChangeLog

+2017-09-27  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
+	* gcc.dg/vect/pr65947-9.c: Use signed char explicitly.
+
 2017-09-26  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	* gcc.target/powerpc/pr71977-1.c: Update test to know that we

gcc/testsuite/gcc.dg/vect/pr65947-9.c

@@ -10,7 +10,7 @@ extern void abort (void) __attribute__ ((noreturn));
    vectorize because the vectorisation requires a slot for default values.  */
 
 signed char __attribute__((noinline,noclone))
-condition_reduction (char *a, char min_v)
+condition_reduction (signed char *a, signed char min_v)
 {
   signed char last = -72;