[PATCH] [YAMLIO] Make line-wrapping configurable and test it.

[Frederic Riss]

Hi bogner,

We would wrap flow mappings and sequences when they go over a hardcoded 70
characters limit. Make the wrapping column configurable (and default to 70
co the change should be NFC for current users). Passing 0 allows to completely
suppress the wrapping which makes it easier to handle in tools like FileCheck.

http://reviews.llvm.org/D10109

Files:
  docs/YamlIO.rst
  include/llvm/Support/YAMLTraits.h
  lib/Support/YAMLTraits.cpp
  unittests/Support/YAMLIOTest.cpp

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