[PATCH] [C++11] Add overloads for externally used OwningPtr functions.

[David Blaikie]

  Could we just change the externally-used APIs to use unique_ptr and provide (I think perhaps you've already implemented this) an implicit conversion from OwningPtr to unique_ptr? (I guess it'd have to be rvalue overloaded, which I realize doesn't work for MSVC... not sure if that's a complete blocker)

http://llvm-reviews.chandlerc.com/D2962