add tests/simple_test.sh.

这是一个简单测试脚本，主要测试policy和read_unique分别设置会不会有影响，这两条配置会共用一个寄存器。

tests/simple_test.sh

+#!/bin/bash
+
+GREP=cpu\(1\)
+
+echo "Policy set test, (exp:0~15):"
+for i in {0..15}
+do
+        echo $i > /sys/class/misc/prefetch/policy
+        cat /sys/class/misc/prefetch/policy | grep $GREP
+done
+
+echo "Set read_unique to 0, (exp:close,15):"
+echo 0 > /sys/class/misc/prefetch/read_unique
+cat /sys/class/misc/prefetch/read_unique | grep $GREP
+cat /sys/class/misc/prefetch/policy | grep $GREP
+echo "Set policy to 8, (exp:close,8):"
+echo 8 > /sys/class/misc/prefetch/policy
+cat /sys/class/misc/prefetch/read_unique | grep $GREP
+cat /sys/class/misc/prefetch/policy | grep $GREP
+
+echo "Set read_unique to 1, (exp:open,8):"
+echo 1 > /sys/class/misc/prefetch/read_unique
+cat /sys/class/misc/prefetch/read_unique | grep $GREP
+cat /sys/class/misc/prefetch/policy | grep $GREP
+
+echo "Set policy to 10, (exp:open,10):"
+echo 10 > /sys/class/misc/prefetch/policy
+cat /sys/class/misc/prefetch/read_unique | grep $GREP
+cat /sys/class/misc/prefetch/policy | grep $GREP
+
+
+echo "Set policy to 5, (exp:open, 5):"
+echo 5 > /sys/class/misc/prefetch/policy
+cat /sys/class/misc/prefetch/read_unique | grep $GREP
+cat /sys/class/misc/prefetch/policy | grep $GREP
+
+echo "Set read_unique to 0, (close,5):"
+echo 0 > /sys/class/misc/prefetch/read_unique
+cat /sys/class/misc/prefetch/read_unique | grep $GREP
+cat /sys/class/misc/prefetch/policy | grep $GREP
+
+echo "Set read_unique to 1, (open,5):"
+echo 1 > /sys/class/misc/prefetch/read_unique
+cat /sys/class/misc/prefetch/read_unique | grep $GREP
+cat /sys/class/misc/prefetch/policy | grep $GREP