[PATCH] YAML: Implement block scalar parsing

[Alex Lorenz]

Hi bogner, bob.wilson, dexonsmith,

This patch implements the parsing of YAML block scalars. Some code existed there before, but it couldn't parse block scalars.
This patch is based on the patch 'http://reviews.llvm.org/D9448' that enables the YAMLParser tests.
I've added a new yaml node type to represent the block scalar values.
I've deleted the files 'spec-09-27.test' and 'spec-09-28.test' as they are identical to the file 'spec-09-26.test'.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9503

Files:
  include/llvm/Support/YAMLParser.h
  lib/Support/YAMLParser.cpp
  test/YAMLParser/spec-09-14.test
  test/YAMLParser/spec-09-18.test
  test/YAMLParser/spec-09-19.test
  test/YAMLParser/spec-09-20.test
  test/YAMLParser/spec-09-21.test
  test/YAMLParser/spec-09-22.test
  test/YAMLParser/spec-09-24.test
  test/YAMLParser/spec-09-25.test
  test/YAMLParser/spec-09-26.test
  test/YAMLParser/spec-09-27.test
  test/YAMLParser/spec-09-28.test
  test/YAMLParser/spec-09-29.test
  test/YAMLParser/spec-09-30.test
  test/YAMLParser/spec-09-31.test
  test/YAMLParser/spec-09-32.test
  test/YAMLParser/spec-09-33.test
  unittests/Support/YAMLParserTest.cpp
  utils/yaml-bench/YAMLBench.cpp

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