Fix alignment errors in the power8 saxpy kernel
#include "common.h"
+ #define offset_0 0
+ #define offset_1 16
+ #define offset_2 32
+ #define offset_3 48
+ #define offset_4 64
+ #define offset_5 80
+ #define offset_6 96
+ #define offset_7 112
+ #define offset_8 128
+ #define offset_9 144
+ #define offset_10 160
+ #define offset_11 176
+ #define offset_12 192
+ #define offset_13 208
+ #define offset_14 224
+ #define offset_15 240
+#if defined(__VEC__) || defined(__ALTIVEC__)
#ifndef HAVE_KERNEL_8
#include <altivec.h>