[PATCH] Implemented llvm::sys::locale::columnWidth and isPrint for Linux (addresses PR14910).

[Alexander Kornienko]

  Addressed reviewer's comments:
  Moved isCharInSet from clang/lib/Lex/UnicodeCharSets.h to include/llvm/Support/UnicodeCharRanges.h (there'll be a separate patch for Clang).
  Converted wcwidth.c to a C++ header, changed it to use isCharInSet and UnicodeCharRange.
  Other minor changes.

Hi jordan_rose, gribozavr,

http://llvm-reviews.chandlerc.com/D1121

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1121?vs=2748&id=2794#toc

Files:
  include/llvm/Support/UnicodeCharRanges.h
  lib/Support/LocaleGeneric.inc
  lib/Support/wctype_control_ranges.inc
  lib/Support/wcwidth.h
  unittests/Support/CMakeLists.txt
  unittests/Support/LocaleTest.cpp
  utils/unicode
  utils/unicode/DerivedGeneralCategory.txt
  utils/unicode/genwctype.sh
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