[PATCH] YAML: Implement block scalar parsing

[Alex Lorenz]

I've applied Duncan's suggestions to this patch:

- Got rid of line folding, it will go into a separate patch.
- Refactored and extracted functions that scan block scalar header, chomping indicator, indent indicator, search for block's indentation and scan the block indentation.
- Added helper functions `advanceWhile`, `consumeLineBreakIfPresent` and `applyChompingIndicator`.
- Decided to keep the name `Start` instead of renaming it to `BlockStart`.
- Used a SmallString instead of an output stream.
- Asserted that the first character is either an '|' or '>'.


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
  unittests/Support/YAMLParserTest.cpp
  utils/yaml-bench/YAMLBench.cpp

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