clang update 3.6

[bluerise]

We should update our clang to 3.4.1 to get a few fixes in. Also, I have seen FDE changes, which might be helpful for #23.

Edit: update to clang 3.5 instead

[artob]

Perhaps Clang 3.5 at this point?

[bluerise]

Yep. We thought about going to clang 3.4.2 before the Bitrig 1.0 release. But we'll release it with clang 3.4.0 and upgrade directly to clang 3.5 then.

[bluerise]

With clang 3.6 being due in less than a month, the goal is to get clang 3.6 in.

I already have a branch with a current checkout of the llvm tree, so most of the hard work is already done.

[bluerise]

Updated to the current HEAD of llvm.

[bluerise]

Done!