add bench testsuite for ktap performance benchmark

first benchmarch is sembench for context switch(futex/wakeup, etc)

Using command: ./sembench -t 200 -w 20 -r 30 -o 2

Overhead of ktap interpreter is nearly 10%(or a little more)

Need optimize more

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>