[PATCH] [Support] Add a Unicode conversion wrapper from UTF16 to UTF8

[Reid Kleckner]

    - ArrayRef-ize, add hasBOM helper.

Hi aaron.ballman,

http://llvm-reviews.chandlerc.com/D1138

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1138?vs=2799&id=2839#toc

Files:
  include/llvm/Support/ConvertUTF.h
  lib/Support/ConvertUTFWrapper.cpp
  unittests/Support/CMakeLists.txt
  unittests/Support/ConvertUTFTest.cpp
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