A low overhead nanosecond timestamp reader in C++ for X86

[饶萌]

Hi,

I've created a simple C++ nanosecond timestamp reader class which can replace the use of clock_gettime()/chrono::high_resolution_clock::now(), because it's much more efficient and stable in terms of latency: in around 10 ns for getting a ns timestamp.

The project is https://github.com/MengRao/tscns. Thanks for giving advices.

Regards,

Meng