[CFT] Update to clang 3.4

[Ed Schouten]

Hi Dimitry,

2014/1/1 Dimitry Andric <dim at freebsd.org>:
> Another important new issue is that clang 3.4 now outputs DWARF4 as
> default format when using -g.  Our ancient version of gdb in base does
> not support this, so you must either install the gdb port, or build lldb
> and use it (very experimental at this time!).

Would it make sense to just change our copy of Clang to emit DWARF2
when using -g? People expect that -g emits something that can be used
by our shipped version of gdb.

-- 
Ed Schouten <ed at 80386.nl>