[PATCH] Add CodeGenABITypes.h for use in LLDB.

[dag at cray.com]

Reid Kleckner <rnk at google.com> writes:

> I seem to recall that Cray wanted something like this at one point,
> but I think they were solving a different problem. They were trying to
> produce LLVM IR from a different C++ frontend and wanted to reuse the
> unfortunately overly complicated logic in clang for how we map that
> down to LLVM IR. I guess this won't help them, since it takes in clang
> AST nodes, which they don't have.

Yeah, won't really be useful for us but this is good code to have.  :)

                          -David