[PATCH] [x32] Add X32 backend

[Pavel Chupin]

Thanks for comments.
I'll open new thread at llvmdev and provide some sort of roadmap and list of changes required.

>>! In D4181#20, @dschuff wrote:
> Also I might be interested in trying this out myself, what would I need to be able to do that? Just a distro with x32 libs?

Yes. You need kernel and libs supporting x32. Ubuntu 14 has x32 packages available to try.

http://reviews.llvm.org/D4181