PR83004: Accidental change to pr81136.c for VECTOR_BITS==128

r254589 was supposed to leave tests unchanged for the default
VECTOR_BITS==128, but I must have got my sums wrong on pr81136.c.

2017-11-22  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/testsuite/
	PR testsuite/83004
	* gcc.dg/vect/pr81136.c: Restore previous alignment of 32
	in the default case.

From-SVN: r255058

gcc/testsuite/ChangeLog

+2017-11-22  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	PR testsuite/83004
+	* gcc.dg/vect/pr81136.c: Restore previous alignment of 32
+	in the default case.
+
 2017-11-22  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/83044

gcc/testsuite/gcc.dg/vect/pr81136.c

@@ -2,7 +2,13 @@
 
 #include "tree-vect.h"
 
-struct __attribute__((aligned (VECTOR_BITS / 8)))
+#if VECTOR_BITS > 256
+#define ALIGNMENT (VECTOR_BITS / 8)
+#else
+#define ALIGNMENT 32
+#endif
+
+struct __attribute__((aligned (ALIGNMENT)))
 {
   char misaligner;
   int foo[100];