[PATCH] Add a function to get the largest address space pointer size

[Matt Arsenault]

  I think it's usually the opposite, you add the function and then the uses separately.

  I think I might need this at some point, but for the case I mentioned I have a better idea (http://llvm-reviews.chandlerc.com/D1669)

http://llvm-reviews.chandlerc.com/D1665