[PATCH] Add support for le64.

[Derek Schuff]

>>! In D5318#14, @rafael wrote:
> So you mean we can delete CC_PnaclCall and attr_pnaclcall from clang?

Yes. We are currently in the process of merging our changes up to tip, at which point I plan on doing it myself. But if you are in a hurry I'll be happy to review it before then :)

By the way, it should be safe to just remove it completely, right? There aren't any enums or anything that need to remain stable?

http://reviews.llvm.org/D5318