[PATCH] Adding SmallString support to raw_ostream and Twine

[Yaron Keren]

This is the first part of making  SmallString::str() return std::string, adding SmallString support to raw_ostream and Twine so that we would be able to remove str() usage for these frequent cases. I broke this from http://reviews.llvm.org/D6336 for easier review.

http://reviews.llvm.org/D6372

Files:
  include/llvm/ADT/Twine.h
  include/llvm/Support/raw_ostream.h
  lib/Support/Twine.cpp
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