Add missing "s390" while expanding vec_step to __builtin_s390_vec_step.
gcc/ChangeLog:
* config/s390/vecintrin.h (vec_step): Expand vec_step to
__builtin_s390_vec_step.
| __VEC_CLASS_FP_INFINITY)
/* This also accepts a type for its parameter, so it is not enough
- to #define vec_step to __builtin_vec_step. */
-#define vec_step(x) __builtin_vec_step (* (__typeof__ (x) *) 0)
+ to #define vec_step to __builtin_s390_vec_step. */
+#define vec_step(x) __builtin_s390_vec_step (* (__typeof__ (x) *) 0)
static inline int
__lcbb(const void *ptr, int bndry)