[PATCH] [YAML] Recover gracefully when deserializing invalid YAML input.

[Andrew Tulloch]

  Updated with reviewer comments, and added unit tests covering the empty string for the sequence/map with {required, optional} keys cases.

Hi gribozavr, kledzik, rsmith, bkramer, chandlerc,

http://llvm-reviews.chandlerc.com/D1236

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1236?vs=3142&id=5572#toc

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