Add YAML parser to Support.

llvm-svn: 153977
diff --git a/llvm/test/YAMLParser/empty-document-bug.data b/llvm/test/YAMLParser/empty-document-bug.data
new file mode 100644
index 0000000..fa131fe
--- /dev/null
+++ b/llvm/test/YAMLParser/empty-document-bug.data
@@ -0,0 +1,2 @@
+# RUN: yaml-bench -canonical %s
+