[PATCH] Move generic isPrint and columnWidth implementations to a separate header/source to allow using both generic and system-dependent versions on win32.

[Alexander Kornienko]

Hi jordan_rose,

This is needed so we can use generic columnWidthUTF8 in clang-format on
win32 simultaneously with a separate system-dependent implementations of
isPrint/columnWidth in TextDiagnostic.cpp to avoid attempts to print Unicode
characters using narrow-character interfaces (which is not supported on Windows,
and we'll have to figure out how to handle this).

http://llvm-reviews.chandlerc.com/D1559

Files:
  include/llvm/Support/Unicode.h
  lib/Support/CMakeLists.txt
  lib/Support/Locale.cpp
  lib/Support/LocaleGeneric.inc
  lib/Support/LocaleWindows.inc
  lib/Support/LocaleXlocale.inc
  lib/Support/Unicode.cpp
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