LuaJIT for ARM64

The LuaJIT for ARM64 JIT porting team declared the port to be "functionally correct" on September 28, 2016 with the following luajit@lists.linaro.org mailing list post:

Please see the following presentation (starting at minute 15:50) on the ARM64 JIT porting status that was given at Linaro Connect - Las Vegas - September 28, 2016.

RT-RK engineers have performed the final cleanup patch (which unified the style) and squashed the porting commits to create the following commit against the 2.1 beta:

The next tasks are as follows:

1. Upstreaming effort

2. Integration testing Nginx

3. AArch64 Optimization