[llvm-commits] Twine/StringRef enhancements & usage

[David Blaikie]

> Here's some more Twine-ification of APIs.

[hold off on this - I realized I've broken MemoryBuffer and possibly
something else that's causing some clang arc migration tests to fail.
I'll update once I've got things passing (make check-lit and make
clang-test at least. I'm open to further recommended tests to try) or
at least explained]