This commit implements the parsing of YAML block scalars.
Some code existed for it before, but it couldn't parse block
scalars.
This commit adds a new yaml node type to represent the block
scalar values.
This commit also deletes the 'spec-09-27' and 'spec-09-28' tests
as they are identical to the test file 'spec-09-26'.
This commit introduces 3 new utility functions to the YAML scanner
class: `skip_s_space`, `advanceWhile` and `consumeLineBreakIfPresent`.
Reviewers: Duncan P. N. Exon Smith
Differential Revision: http://reviews.llvm.org/D9503
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237314 91177308-0d34-0410-b5e6-96231b3b80d8
