mmap implementation for ANON mapping with desired address

[Alexander Tormasov]

	Hello,

> 
> Unfortunately, I am currently occupied with other tasks and only skimmed
> over your reposonse so far. From what I gathered things are not as easy
> as I thought them too be, which is whay I am going to spend some time
> over christmas to look into Golang's internals (I guess on that account
> TamaGo is probably also worth a look) to gain a bit more insight and
> will get back to you after that.

golang runtime is around 800k source lines with deep OS sys calls integration, I spent 1-2 month to dig.
So, feel free to ask about, this could speedup things