[PATCH] Implement switch to separate SYSCALL call stack

This patch implements separate syscall call stack needed when runtimes like Golang use SYSCALL instruction to make system call. More specifically each application thread pre-alllocates "tiny" (1024 bytes deep) syscall call stack. When SYSCALL instruction is called the call stack is switched to

Re: [PATCH] Implement switch to separate SYSCALL call stack

I am expecting this patch will need some tweaking but I think it fundamentally implements SYSCALL call stack switch. I have tested in using my golang working branch. First of all I am assembly novice so I am not sure if I have not messed some stuff in entry.S. For example I am not sure I have