[libc++] Porting libc++ to Windows

I was using GitHub just because I’ve never used Phabricator. If you can give me some pointers I’ll switch to that. I will also squashing the commits.

Regards,

Fulvio

I would prefer phabricator simply because it will get lost on my TODO
list otherwise. To use phabricator I just run "git diff master" and
upload that diff to phabricator (assuming your branch in up to date
with the HEAD of master).

/Eric

I would prefer phabricator simply because it will get lost on my TODO
list otherwise. To use phabricator I just run "git diff master" and
upload that diff to phabricator (assuming your branch in up to date
with the HEAD of master).

`git diff master -U999` is preferred to make reviews easier.

Jon